How to Grow Marigolds in the UK: Complete Growing Guide

Growing marigolds in the UK is a fantastic way to add vibrant colour to your garden, patio or allotment throughout summer and autumn.

Marigolds are among the easiest summer bedding flowers to grow from seed. With their cheerful yellow, orange, red and golden flowers, they brighten up borders, raised beds, hanging displays and containers.

They’re particularly popular with allotment gardeners because some varieties can be grown alongside vegetables, providing attractive flowers and supporting visiting pollinating insects.

One of the best things about marigolds is their long flowering season.

With suitable care and regular deadheading, they can continue producing flowers from early summer until the first autumn frosts.

Here at Gardening with Ben, I enjoy including flowers alongside vegetables on the allotment. They make the growing space more colourful and provide useful floral resources for wildlife.

Marigolds are an excellent choice for this approach because they’re relatively inexpensive, easy to start from seed and available in many different sizes.

Whether you’re looking for compact flowers for containers or taller plants for a summer border, there’s usually a suitable marigold variety.

In this complete UK growing guide, we’ll explore everything you need to know about marigolds, including choosing varieties, sowing seeds, planting outdoors, watering, feeding, deadheading, companion planting and collecting seeds.

We’ll also explain the difference between French and African marigolds and look at common problems that can affect these colourful flowers.

What Are Marigolds?

Marigolds are flowering plants belonging to the Asteraceae family.

The name marigold is commonly used for two different groups of flowers.

Tagetes Marigolds

These include French marigolds and African marigolds.

They’re the familiar summer bedding plants with bright yellow, orange and red flowers.

Calendula Marigolds

Pot marigolds, Calendula officinalis, are different plants.

They’re often grown as hardy annual flowers and have different growing requirements.

Although both are called marigolds, this guide focuses primarily on Tagetes varieties.

French Marigolds vs African Marigolds

The two main types of bedding marigolds are French marigolds and African marigolds.

French Marigolds

French marigolds belong mainly to the species Tagetes patula.

They usually produce compact, bushy plants with numerous flowers.

Flower colours include:

• Yellow
• Orange
• Red
• Mahogany
• Bicolour combinations

They’re particularly useful for containers, borders and growing alongside vegetables.

African Marigolds

African marigolds belong mainly to Tagetes erecta.

Despite the name, this species originates from Mexico and Central America.

African marigolds often produce larger, rounded flower heads.

Many varieties are taller than French marigolds.

They’re excellent for creating bold displays in flower borders.

Marigold Growing Facts

Feature	Details
Botanical name	Tagetes species
Plant family	Asteraceae
Plant type	Tender annual
Flowering season	Summer to autumn
Flower colours	Yellow, orange, red, gold and combinations
Preferred position	Full sun
Soil	Fertile, well-drained
Indoor sowing	March–April
Outdoor sowing	May–June after frost risk
Planting outside	After the last frost
Typical height	15–90cm, depending on variety
Difficulty	Easy
Pollinator friendly	Many open-flowered varieties

Why Grow Marigolds in Your Garden?

Marigolds have several advantages.

Beautiful Summer Colour

Their bright flowers can transform containers and borders.

Easy to Grow from Seed

Marigolds germinate readily in suitable conditions.

Long Flowering Season

Many varieties continue flowering until autumn frost.

Suitable for Containers

Compact French marigolds are excellent for pots and patio displays.

Useful on Allotments

They can be grown alongside vegetable crops without requiring a separate large flower bed.

Attractive to Pollinators

Open-flowered varieties can provide nectar and pollen for visiting insects.

Affordable

Growing marigolds from seed is an inexpensive way to produce numerous plants.

Best Marigold Varieties to Grow in the UK

There are many attractive varieties available.

French Marigold ‘Durango’

The Durango series produces compact, bushy plants with colourful flowers.

Best for: Containers and summer bedding.

French Marigold ‘Bonanza’

A popular series producing double flowers in various colours.

Best for: Flower borders and patio containers.

French Marigold ‘Disco’

Known for its single flowers and compact growth.

Best for: Pollinator-friendly displays and bedding.

French Marigold ‘Naughty Marietta’

Produces yellow flowers with contrasting reddish-brown markings.

Best for: Cottage gardens and mixed borders.

African Marigold ‘Crackerjack’

A tall-growing mixture producing large yellow and orange flowers.

Best for: Bold summer borders.

African Marigold ‘Antigua’

A compact series with large flower heads.

Best for: Containers and bedding displays.

African Marigold ‘Inca’

Produces large, rounded flowers on relatively compact plants.

Best for: Showy summer colour.

Tagetes tenuifolia ‘Lemon Gem’

Produces numerous small, lemon-yellow flowers.

Best for: Containers, edging and informal planting.

Tagetes tenuifolia ‘Tangerine Gem’

A compact variety with masses of small orange flowers.

Best for: Edging and colourful patio displays.

When to Sow Marigold Seeds in the UK

Knowing when to sow marigold seeds is important because Tagetes marigolds are sensitive to frost.

Best Time to Sow Indoors

March and April are generally suitable.

Best Time to Sow Outdoors

May or June, once frost risk has passed and the soil has warmed.

Can You Sow Marigolds in February?

It’s possible with suitable warmth and strong growing lights, but early sowing can result in leggy plants if light levels are poor.

Can You Sow Marigolds in July?

Some quick-growing varieties may still flower from an early July sowing in favourable conditions, although the flowering season will be shorter.

UK Marigold Growing Calendar

Month	Gardening activity
January	Plan varieties and order seeds
February	Prepare trays and growing equipment
March	Begin indoor sowing
April	Continue sowing indoors
May	Harden off plants and plant after frost risk
June	Finish planting and begin regular care
July	Enjoy flowers and deadhead
August	Continue watering and deadheading
September	Enjoy late flowers and collect seeds
October	Collect ripe seeds and clear frost-damaged plants
November	Compost healthy finished plants
December	Plan next year’s displays

How to Grow Marigolds from Seed Indoors

Starting marigolds indoors is a reliable way to produce strong plants for summer.

Step 1: Prepare Seed Trays

Use clean seed trays, modules or small pots.

Step 2: Fill with Compost

Choose suitable peat-free seed compost.

Step 3: Sow the Seeds

Place seeds on the compost surface.

Step 4: Cover Lightly

Cover with approximately 5mm of compost, following the seed packet instructions.

Step 5: Water Gently

Moisten the compost without making it waterlogged.

Step 6: Provide Warmth

A temperature around 18–21°C is generally suitable for germination.

Step 7: Wait for Germination

Seeds commonly germinate within approximately 5–14 days in suitable conditions.

Step 8: Provide Plenty of Light

Move seedlings into a bright position once they emerge.

Step 9: Pot On Seedlings

Transfer seedlings into individual pots when they’re large enough to handle.

Step 10: Harden Off

Gradually acclimatise plants to outdoor conditions before planting.

How to Sow Marigolds Directly Outdoors

Marigolds can also be sown directly into garden soil.

Step 1: Choose a Sunny Position

Select a location receiving plenty of sunlight.

Step 2: Prepare the Soil

Remove weeds and rake the soil to a fine texture.

Step 3: Sow Seeds Thinly

Follow the spacing and depth recommendations on the seed packet.

Step 4: Cover Lightly

Cover with a thin layer of soil.

Step 5: Water Carefully

Keep soil moist during germination.

Step 6: Thin Seedlings

Allow enough space for plants to develop.

Step 7: Protect Young Plants

Watch for slugs and snails.

Where Is the Best Place to Grow Marigolds?

Marigolds generally prefer full sun.

Full Sun

Choose a position receiving at least six hours of direct sunlight during summer where possible.

Well-Drained Soil

Avoid areas where water collects for long periods.

Sheltered Positions

Shelter can help protect taller varieties from strong winds.

Containers

Compact marigolds are excellent for sunny patios.

Raised Beds

Marigolds can be grown around the edges of vegetable beds.

Allotments

They provide attractive summer colour alongside suitable vegetable crops.

Best Soil for Growing Marigolds

Marigolds generally prefer fertile, well-drained soil.

Clay Soil

Marigolds can grow in clay soil if drainage is adequate.

Sandy Soil

Sandy soil may need additional organic matter to improve moisture retention.

Compost

Well-rotted compost can help improve soil structure.

Avoid Waterlogging

Persistently wet soil can cause root problems.

Soil pH

Marigolds tolerate a reasonably broad range of soil pH levels.

When to Plant Marigolds Outside in the UK

Marigolds should be planted outdoors after the risk of frost has passed.

Southern England

Planting may be possible around mid-to-late May in suitable conditions.

Northern England

Late May or early June may be safer.

Scotland and Exposed Gardens

Planting may need to wait until June.

Why Does Frost Matter?

Marigolds are tender annuals.

Frost can damage or kill young plants.

Always check local weather conditions rather than relying entirely on calendar dates.

How to Plant Marigolds Step by Step

Step 1: Harden Off Plants

Gradually introduce plants to outdoor conditions over approximately one to two weeks.

Step 2: Prepare the Border

Remove weeds and improve soil where necessary.

Step 3: Water Plants

Water potted plants before planting.

Step 4: Dig Planting Holes

Make holes large enough for the root balls.

Step 5: Position Plants

Plant at approximately the same depth as they were growing in their pots.

Step 6: Space Correctly

Follow the recommended spacing for your variety.

Step 7: Firm the Soil

Gently firm around the roots.

Step 8: Water Thoroughly

Water immediately after planting.

How Far Apart Should You Plant Marigolds?

Spacing depends on variety.

Compact French Marigolds

Approximately 15–25cm apart.

Medium-Sized Marigolds

Approximately 25–35cm apart.

Tall African Marigolds

Approximately 30–45cm apart, sometimes more for vigorous varieties.

Why Is Spacing Important?

Good spacing improves airflow and allows plants to develop naturally.

How to Grow Marigolds in Pots

Marigolds are excellent container plants.

Choosing a Container

Select a pot with drainage holes.

A container approximately 20–30cm across can be suitable for a compact plant, depending on variety.

Best Compost

Use suitable peat-free multipurpose compost.

Position

Place containers in full sun.

Watering

Check compost regularly during warm weather.

Feeding

A suitable balanced liquid fertiliser can be used when nutrients become depleted.

Deadheading

Remove faded flowers to encourage continued blooming.

How Often Should You Water Marigolds?

Marigolds prefer consistent moisture during establishment.

Newly Planted Marigolds

Water regularly until established.

Established Border Plants

Water during prolonged dry weather.

Container-Grown Marigolds

Containers may need frequent watering during hot conditions.

Avoid Overwatering

Waterlogged compost can damage roots.

Best Watering Method

Water around the base of plants.

Do Marigolds Need Feeding?

Marigolds generally don’t require excessive feeding.

Garden Soil

Plants growing in reasonably fertile soil may need little additional fertiliser.

Containers

Container-grown plants may benefit from modest feeding during the flowering season.

Avoid Excess Nitrogen

Too much nitrogen can encourage foliage rather than flowers.

Best Approach

Follow fertiliser instructions and avoid overfeeding.

Should You Pinch Out Marigolds?

Pinching out can encourage bushier growth in some varieties.

What Is Pinching Out?

Removing the main growing tip of a young plant.

Benefits

• Encourages branching
• Can create bushier plants
• May increase flowering stems
• Helps manage growth

Is Pinching Essential?

No.

Many modern marigold varieties naturally develop compact, bushy growth.

How to Deadhead Marigolds

Deadheading is one of the best ways to maintain a long flowering season.

What Is Deadheading?

Removing faded flowers before they develop mature seeds.

Why Deadhead Marigolds?

It helps keep plants tidy and encourages continued flowering.

How to Deadhead

1. Identify a faded flower.
2. Follow the flower stem down to a suitable leaf joint.
3. Remove the spent flower using clean fingers or snips.
4. Repeat regularly.

How Often Should You Deadhead?

Check plants every few days during peak flowering.

What Happens If You Don’t Deadhead?

Plants may direct more energy towards seed production.

Flowering can gradually decline.

How to Get More Flowers on Marigolds

For a long-lasting display, follow these tips.

1. Provide Plenty of Sunshine

Marigolds flower best in sunny conditions.

2. Deadhead Regularly

Remove faded flowers.

3. Avoid Excessive Fertiliser

Too much nitrogen can reduce flowering.

4. Water During Dry Weather

Severe drought can affect flower production.

5. Choose Suitable Varieties

Some varieties naturally produce more flowers than others.

6. Remove Damaged Growth

Keep plants healthy and tidy.

7. Avoid Overcrowding

Allow suitable spacing.

When Do Marigolds Flower in the UK?

Marigolds generally begin flowering during late spring or summer, depending on sowing date and growing conditions.

Early Indoor Sowing

Plants started indoors may begin flowering during late May or June in favourable conditions.

Outdoor Sowing

Direct-sown plants generally flower later.

How Long Do Marigolds Flower?

Many varieties can continue flowering through summer and autumn.

Do Marigolds Flower Until October?

Yes, in favourable conditions.

The first significant frost usually ends the flowering season.

Are Marigolds Good for Bees and Butterflies?

Many marigold varieties can attract pollinating insects.

Best Marigolds for Pollinators

Single-flowered varieties are generally a good choice because their central florets are more accessible.

Pollinators That May Visit

• Bumblebees
• Solitary bees
• Hoverflies
• Butterflies
• Other beneficial insects

Important Consideration

Highly doubled varieties may provide less accessible nectar and pollen than open-flowered types.

Are Marigolds Good Companion Plants for Vegetables?

Marigolds are frequently grown alongside vegetables.

However, it’s important to separate proven benefits from popular gardening claims.

Marigolds and Tomatoes

French marigolds can be grown alongside tomatoes.

Some research suggests particular Tagetes species or varieties may influence certain pests under specific conditions, but simply planting marigolds next to tomatoes doesn’t guarantee pest control.

Marigolds and Carrots

Marigolds can be included in mixed vegetable beds, but they aren’t a reliable substitute for physical protection against carrot fly.

Marigolds and Brassicas

They provide flowers for visiting insects but won’t prevent caterpillar damage.

Marigolds and Beans

Marigolds can add colour around bean-growing areas.

Marigolds and Cucumbers

Their flowers can help provide additional resources for pollinators visiting the garden.

Important Advice

Use marigolds as part of a diverse planting scheme rather than relying on them to eliminate pests.

Do Marigolds Repel Aphids?

Marigolds are sometimes claimed to repel aphids.

However, evidence for reliable aphid control simply by planting marigolds nearby is limited.

Marigolds themselves can occasionally attract aphids.

Better Aphid Management

• Inspect plants regularly
• Encourage natural predators
• Remove small infestations where practical
• Avoid excessive nitrogen feeding
• Maintain healthy plants

Do Marigolds Help Control Nematodes?

Certain Tagetes species and varieties can suppress some plant-parasitic nematodes when grown under suitable conditions.

However, effectiveness depends on the nematode species, marigold variety, growing duration and management.

Planting a few marigolds beside vegetables is not a guaranteed treatment.

For most home gardeners, marigolds are best valued for their flowers and contribution to planting diversity.

How to Grow Marigolds on an Allotment

Marigolds are useful flowers for allotment gardens.

Suitable Locations

• Around vegetable beds
• Along pathways
• In raised beds
• Near greenhouses
• In flower borders
• In containers

Benefits

They provide colour and can attract visiting insects.

Choosing Varieties

Compact French marigolds are useful around bed edges.

Taller African marigolds are better suited to larger borders.

Important Consideration

Avoid planting tall varieties where they may shade vegetables.

How to Collect Marigold Seeds

Collecting seeds is a useful way to grow more marigolds the following year.

Step 1: Leave Selected Flowers

Stop deadheading a few healthy flowers towards the end of the season.

Step 2: Allow Seed Heads to Mature

Wait until flower heads become dry and brown.

Step 3: Collect in Dry Weather

Choose dry seed heads.

Step 4: Remove Seeds

Carefully open the dried flower heads.

Step 5: Dry Thoroughly

Allow seeds to dry completely.

Step 6: Store Correctly

Place seeds in labelled paper packets.

Step 7: Keep Cool and Dry

Store until the next sowing season.

Will Saved Marigold Seeds Grow True to Type?

Not always.

Open-pollinated varieties may resemble the parent plants, but cross-pollination can introduce variation.

Seeds saved from F1 hybrids may produce plants with different characteristics.

Do Marigolds Self-Seed in the UK?

Yes, marigolds can occasionally self-seed in suitable conditions.

However, Tagetes seeds and seedlings are sensitive to cold and wet conditions.

Self-seeding is less reliable than with hardy annual flowers.

How to Encourage Self-Seeding

Allow some flowers to develop mature seeds.

Leave suitable areas of soil undisturbed.

Will Self-Seeded Marigolds Survive Winter?

Established Tagetes plants are not frost hardy.

Any successful self-seeding depends on seeds surviving until conditions become suitable for germination.

Can Marigolds Survive Winter in the UK?

Most bedding marigolds are grown as tender annuals.

They usually die after significant autumn frost.

Can You Overwinter Marigolds Indoors?

It’s sometimes possible to keep individual plants alive in warm, bright conditions, but this is generally less practical than growing fresh plants from seed.

Should You Remove Dead Marigolds?

Yes.

Once frost has damaged plants, remove them from borders and containers.

Can You Compost Marigolds?

Healthy plant material can usually be composted.

Common Problems When Growing Marigolds

Although marigolds are relatively easy to grow, several problems can occur.

Marigold Seeds Not Germinating

Possible causes include:

• Compost too cold
• Excessive moisture
• Old seeds
• Sowing too deeply
• Compost drying out

Leggy Marigold Seedlings

Insufficient light is a common cause.

Move seedlings into a brighter position.

Marigolds Growing Leaves but No Flowers

Possible causes include:

• Excessive nitrogen
• Insufficient sunlight
• Immature plants
• Environmental stress

Yellowing Leaves

Possible causes include:

• Overwatering
• Drought
• Root problems
• Nutrient imbalance
• Natural ageing

Slugs and Snails

Young marigolds can suffer damage from slugs and snails.

Aphids

Aphids may gather on tender growth.

Spider Mites

Spider mites can become problematic in hot, dry conditions, particularly under cover.

Grey Mould

Grey mould can affect flowers and foliage in damp, poorly ventilated conditions.

Root Rot

Waterlogged compost can damage roots.

Best Companion Flowers for Marigolds

Marigolds combine beautifully with other summer flowers.

Cosmos

Cosmos provides airy flowers and delicate foliage.

Zinnias

Zinnias complement marigolds with bold colours.

Dahlias

Dahlias provide larger flowers for mixed borders.

Sunflowers

Sunflowers create height behind marigolds.

Calendula

Calendula produces cheerful orange and yellow flowers.

Nasturtiums

Nasturtiums create attractive informal planting combinations.

Salvias

Salvias can provide contrasting flower shapes and colours.

Can You Grow Marigolds in Hanging Baskets?

Yes.

Compact varieties can be grown in suitable hanging baskets.

Choosing Varieties

Select dwarf or compact French marigolds.

Compost

Use suitable peat-free container compost.

Watering

Hanging baskets can dry out quickly during hot weather.

Feeding

Use modest feeding where necessary.

Deadheading

Remove spent flowers regularly.

Safety

Ensure baskets and brackets are securely installed.

Are Marigolds Suitable for Small Gardens?

Yes.

Compact varieties are excellent for limited spaces.

They can be grown in:

• Patio containers
• Window boxes
• Small raised beds
• Courtyard gardens
• Border edges
• Suitable hanging baskets

Choose varieties according to their mature height and spread.

Frequently Asked Questions About Growing Marigolds

Are Marigolds Easy to Grow in the UK?

Yes. Marigolds are among the easier summer bedding flowers to grow from seed.

When Should You Sow Marigold Seeds?

Usually March to April indoors or May to June outdoors.

Can You Sow Marigolds in February?

Yes, with suitable warmth and lighting, but later sowing is often easier.

How Long Do Marigold Seeds Take to Germinate?

Often approximately 5–14 days in suitable conditions.

Can You Sow Marigolds Directly Outside?

Yes, after frost risk has passed and soil temperatures have risen.

When Can Marigolds Go Outside?

After the last expected frost.

Do Marigolds Need Full Sun?

Yes. Full sun generally produces the best flowering.

Can Marigolds Grow in Shade?

They may tolerate partial shade, but flowering can be reduced.

How Far Apart Should You Plant Marigolds?

Approximately 15–45cm, depending on variety.

Can You Grow Marigolds in Pots?

Yes. Compact French marigolds are particularly suitable.

How Often Should You Water Marigolds?

Water according to soil and weather conditions.

Do Marigolds Need Feeding?

Usually only modest feeding is required.

Should You Pinch Out Marigolds?

It can encourage bushier growth in some varieties but isn’t essential.

How Do You Deadhead Marigolds?

Remove faded flower heads by cutting back to a suitable leaf joint.

How Do You Get More Flowers on Marigolds?

Provide full sun, avoid excessive fertiliser and deadhead regularly.

When Do Marigolds Flower?

Usually from early summer into autumn.

Do Marigolds Flower Until October?

Yes, in favourable conditions before significant frost.

Are Marigolds Good for Bees?

Many open-flowered varieties attract pollinating insects.

Do Marigolds Repel Aphids?

Not reliably. Claims of universal aphid repellence are not well supported.

Are Marigolds Good for Tomatoes?

They can be grown alongside tomatoes, but they don’t guarantee pest control.

Do Marigolds Stop Carrot Fly?

No. Physical protection is generally more reliable.

Can You Collect Marigold Seeds?

Yes. Allow selected flower heads to mature and dry.

Do Marigolds Self-Seed?

They sometimes self-seed, although this is not always reliable in the UK.

Do Marigolds Come Back Every Year?

Most bedding marigolds are tender annuals and need to be grown again.

Can Marigolds Survive Frost?

No. Tagetes marigolds are frost tender.

Why Are My Marigolds Not Flowering?

Insufficient sunlight, excessive nitrogen or immature plants may be responsible.

Why Are My Marigold Leaves Turning Yellow?

Possible causes include overwatering, drought or root problems.

Can You Grow Marigolds on an Allotment?

Yes. They’re excellent for flower borders and suitable areas alongside vegetables.

Are French Marigolds Better Than African Marigolds?

Neither is universally better. French marigolds are often compact, while African marigolds generally produce larger flowers.

Final Thoughts: Growing Marigolds Successfully in the UK

Growing marigolds is a fantastic way to bring vibrant colour into your garden or allotment.

They’re easy to grow from seed, available in many different varieties and capable of flowering throughout summer and into autumn.

For the best results, sow seeds indoors during spring or directly outdoors after frost risk has passed.

Choose a sunny position with well-drained soil and avoid excessive feeding.

Regular deadheading will help maintain a colourful display, while watering during prolonged dry periods will keep plants healthy.

Compact French marigolds are excellent for containers and raised beds, while taller African marigolds create impressive displays in larger borders.

Marigolds also work beautifully alongside vegetables, providing colour and floral resources for visiting insects.

And towards the end of the growing season, don’t forget to leave a few flowers to develop seeds for next year.

Whether you’re growing marigolds for the first time or adding more varieties to your allotment, they’re a wonderful flower to include in your summer planting plans.

Keep smiling, keep shining, keep gardening with Ben!