🌱🍁 What Vegetables Can You Plant in September in the UK?
🥕 Introduction: September Shifts the Garden Toward Autumn and Winter
September marks a clear change in the UK vegetable garden. Days are shorter and temperatures begin to cool, but soil is still warm enough to support reliable germination and steady growth. This makes September ideal for autumn sowing, overwintering crops, and quick-growing vegetables that will harvest before winter fully arrives.
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.
Vegetable Plants & Seedlings
Browse Plants
All-Purpose Compost & Soil Improvers
View Compost
Plant Feed & Fertiliser for Strong Growth
Shop Fertiliser
This guide explains exactly which vegetables you can plant in September in the UK, helping you keep beds productive and prepare for harvests through autumn and into early spring.
⭐ Check Out Our Recommended Products
• Seed Trays & Module Pots
Ideal for starting overwintering vegetables.
Click here to see them
• Garden Fleece & Cloches
Protects young plants from early cold nights.
Click here to see them
• Compost & Mulch
Improves soil warmth and structure for autumn sowing.
Click here to see them
🌱🥬 Vegetables You Can Plant in September (UK)
🥬 Lettuce (Winter Varieties)
September is ideal for winter lettuce.
✔ sow directly outdoors or under cover
✔ choose winter-hardy varieties
✔ slow but steady growth
Protection improves survival in cold snaps.
🌱 Spinach
Spinach thrives in early autumn.
✔ sow directly outdoors
✔ overwintering varieties perform best
✔ harvest through autumn and spring
Avoid waterlogged soil.
🥬 Pak Choi & Oriental Greens
Perfect for September sowing.
✔ sow directly outdoors
✔ quick-growing before frost
✔ suitable for protected growing
Cooler weather reduces bolting.
🧅 Spring Onions
Spring onions can be sown now.
✔ sow directly outdoors
✔ overwinter for early spring harvests
✔ reliable and low-maintenance
Choose hardy varieties.
🥬 Radishes
Radishes still grow quickly.
✔ sow directly outdoors
✔ harvest before heavy frosts
✔ ideal for gaps between crops
Shorter days improve flavour.
🥕 Turnips
Turnips suit autumn planting.
✔ sow directly outdoors
✔ quick to mature
✔ harvest young for tenderness
Protect in colder regions.
🥬 Rocket
Rocket grows well in cooler weather.
✔ sow directly outdoors
✔ fast-growing leaves
✔ harvest continuously
Excellent under cover later.
🥬 Mustard Greens
Ideal for autumn leaves.
✔ sow directly outdoors
✔ quick-growing
✔ mild flavour in cool weather
Harvest young for salads.
🧄 Garlic (Late September in Mild Areas)
Garlic can be planted in some regions.
✔ plant cloves directly outdoors
✔ requires long overwintering period
✔ best results in free-draining soil
Main planting season continues into autumn.
🧅 Overwintering Onions (Sets)
September planting gives early harvests.
✔ plant onion sets
✔ establish before winter
✔ harvest earlier next year
Avoid heavy, wet soil.
🌤️🌱 Can You Sow Vegetables Outdoors in September?
Yes, many vegetables are suitable.
✔ cool-weather leafy crops
✔ quick-growing roots
✔ overwintering onions and garlic
Use protection as temperatures drop.
🚫🌱 Vegetables That Are Too Late to Start
Some crops need warmer conditions or a longer season.
❌ tomatoes
❌ courgettes
❌ beans
❌ sweetcorn
❌ peppers
These are finished for the year.
🌟 FAQs
Is September too late to plant vegetables in the UK?
No. Many autumn and overwintering crops thrive when planted now.
Do September crops need protection?
Yes, especially later in the month.
Can I grow vegetables through winter from September sowing?
Yes. Spinach, lettuce, onions, and garlic can overwinter.
Should I water September sowings?
Yes, until autumn rain becomes consistent.
Is September good for beginners?
Yes. Cool weather makes seedling care easier.