What to Sow in September: Our Complete Seed Bundle Guide

September is one of the most rewarding months in the kitchen garden. As summer crops wind down, a whole new season of growing begins — and with the right seeds, you can keep harvesting well into winter. Whether you're a first-time grower or a seasoned allotmenteer, our September seed bundles take the guesswork out of autumn sowing.

Here's everything you can sow this month, grouped by growing style.

Quick Crops and Windowsill Growers

If you want results fast, September is perfect for sprouting seeds and quick-harvest leaves. Our Quick Harvest Collection is built for speed — Cress, Golden Pak Choi, Alfalfa, Fenugreek and Mung Bean Sprouting Seeds mean you can be harvesting within days of opening the packet. No garden required.

For those with a little more space, the Radish and Roots Discovery bundle combines Mixed Radish (ready in as little as three weeks), Giant Winter Spinach, Canton White Pak Choi, Mixed Oriental Leaves and Radish Sprouting Seeds — a compact, productive selection for raised beds and containers alike.

Oriental and Exotic Greens

September is ideal for oriental brassicas and cooking greens, which thrive in the cooler conditions. Our Oriental Stir-Fry Garden brings together Chinese Kale, Chopsuey Greens, Green Pak Choi, Indian Mustard and Komatsuna — everything you need for a wok full of fresh, homegrown flavour.

For something bolder, the Spicy Leaves Selection adds heat and punch with Chilli Pepper, Indian Mustard, Southern Giant Mustard Greens, Corn Salad and Mixed Spicy Leaf. Harvest the leaves young for the best flavour, and start the chilli on a warm windowsill.

Hardy Salads and Winter Leaves

Hardy salad crops sown in September will keep producing through the coldest months, especially under cloches or in a cold frame. Our Winter Salad Starter is the perfect introduction — Arctic King Lettuce, Corn Salad, Endive, Plain Cress and Japanese Green Mizuna, all chosen for their cold tolerance and reliability.

For a more substantial harvest, the Brassica Harvest Mix adds Cauliflower, Calabrese, Chinese Kale and Endive to the mix — hearty crops that will reward patient growers with a proper winter harvest.

Colour and Variety

If you want your kitchen garden to look as good as it tastes, the Colourful Kitchen Garden bundle delivers. Red Amaranthus, Red F1 Pak Choi, Quickfire Chilli Peppers, Corn Salad and Tirza Cauliflower bring drama and colour to beds and containers through autumn.

Soil Care and Green Manures

September is also the ideal time to think about your soil. As beds clear, sowing a green manure protects the soil over winter, suppresses weeds and feeds the ground ready for spring planting. Our Autumn Soil Renewal bundle contains five complementary green manures — Field Beans, Grazing Rye, Overwintering Mix, Winter Tares and Phacelia — covering everything from nitrogen fixing to soil structure improvement.

Sow as soon as beds are cleared and dig in at least two to three weeks before your first spring planting.

September Growing Tips

• Sow early in the month — the earlier you sow in September, the more time crops have to establish before the cold sets in.
• Use cloches and cold frames — extending the season with cover makes a significant difference to yield and quality.
• Fleece is your friend — keep a roll handy for unexpected early frosts, particularly for Pak Choi and Cauliflower.
• Sprouting seeds need no garden — Alfalfa, Mung Bean, Fenugreek and Radish sprouting seeds can all be grown in a jar on your kitchen windowsill year-round.
• Green manures go in last — sow them as the final act on any cleared bed before winter.

Ready to get growing?

Browse our full September Seed Bundles collection and find the right bundle for your garden, allotment or windowsill. All seeds are packed in 100% recyclable packaging and dispatched promptly for September sowing.