🌸🌱 What Flowers to Sow in January (UK Guide)
🌱 Introduction: A Head Start on the Flowering Season
January may seem early for flower sowing, but it’s an excellent month to start slow-growing flowers that need a long season to perform well. The key is indoor sowing, warmth, good light, and patience. Done right, January sowing gives you stronger plants and earlier blooms later in the year.
Keter Manor Outdoor Apex Double Door Garden Storage Shed (6 x 8ft)
A durable and stylish beige and brown garden storage shed perfect for storing garden tools, equipment, bikes, and outdoor essentials. Weather-resistant, low maintenance, and ideal for any garden or allotment setup.
🌱 Compost & Soil Improvers
Give your garden beds a boost before winter with compost and organic matter.
Shop Compost & Soil Improvers
🌿 Autumn Plant Feed & Fertiliser
Prepare your soil for autumn planting with suitable fertilisers and soil nutrients.
Browse Garden Fertilisers
🥬 Seed Trays & Propagation Kits
Keep growing through autumn by starting suitable hardy crops under cover.
Shop Seed Trays
⭐ Recommended Gardening Products
1️⃣ Gardening Planner or Journal
Perfect for mapping beds, tracking sowing dates, and learning from what worked last year.
👉 Click here to see it
2️⃣ Seed Storage Box
Keeps seeds dry, organised, and easy to find when sowing season starts.
👉 Click here to see it
3️⃣ Permanent Garden Markers
Ideal for planning now so you remember what’s planted where later in the year.
👉 Click here to see it
🌡️ What January Conditions Mean
In the UK, January brings:
- Cold temperatures
- Short daylight hours
- Regular frosts
➡️ Nearly all flower sowing in January should be done indoors, on a bright windowsill, or in a heated greenhouse.
🌸 Flowers You Can Sow in January (Indoors or Heated Greenhouse)
🌼 Sweet Peas
- Benefit from early root development
- Sow in deep pots or root trainers
- Grow cool but frost-free
Pinch out later for bushier plants and more flowers.
🌸 Lupins
- Long growing season
- Sow individually as they dislike root disturbance
- Germinate in warmth, then grow on cool
Early sowing produces stronger flowering plants.
🌺 Antirrhinums (Snapdragons)
- Slow to germinate and establish
- Surface sow — seeds need light
- Excellent for early summer colour
🌺 Geraniums (Pelargoniums)
- Very slow-growing from seed
- Needs warmth (around 20–22°C)
- Strong light essential after germination
January sowing leads to much earlier flowering.
🌼 Begonias (from seed)
- Extremely slow to develop
- Surface sow — do not cover seed
- Needs warmth and humidity
Patience is essential, but results are rewarding.
🌱 Perennials You Can Sow in January
Many perennials benefit from early sowing:
- Delphiniums
- Echinacea
- Aquilegia
- Verbena bonariensis
Some perennials germinate better after exposure to winter cold, making January ideal.
🌷 Hardy Annuals You Can Start Early (With Protection)
If you have good protection and light, you can sow small amounts of:
- Larkspur
- Cornflowers
- Nigella
Growth will be slow until daylight levels improve.
🚫 Flowers to Avoid Sowing in January
Avoid fast-growing, warmth-loving flowers:
- Cosmos
- Zinnias
- Sunflowers
- Nasturtiums
These are best sown from March onwards to avoid weak, leggy plants.
🌱 January Flower Sowing Tips for Success
- Use fresh seed compost
- Provide maximum light
- Avoid overwatering in cold conditions
- Keep seedlings frost-free
- Label trays clearly — growth is slow and seedlings look similar
Slow progress is normal in January — don’t panic.
🧠 Key Takeaway
January is perfect for slow-growing flowers and long-season plants. Focus on sweet peas, lupins, antirrhinums, geraniums, begonias, and selected perennials. With warmth, light, and patience now, you’ll enjoy earlier, stronger, and longer-lasting blooms later in the year.
January may be quiet outside — but it’s a powerful month for getting ahead. 🌸