Late sowing for autumn: which vegetables and flowers to sow in August

Why sow in August?

August is a magical month for garden planners. While many gardeners ease off the throttle, this is the ideal time to sow your autumn harvest. The soil is still warm from summer, rainfall increases, and lower temperatures mean vegetables grow slowly, developing fuller flavour. Many autumn crops actually improve after a frost period, becoming sweeter.

Sowing in August gives you a second growing season. Kale, spinach and radicchio sown now can be harvested in October and November. This takes pressure off your garden in the heavy autumn months.

Best vegetables for August sowing

Kale (Brassica oleracea)

Kale prefers cooler months and becomes sweeter after frost exposure. Sow between August 10 and 25 for harvest from October through March. Kale tolerates freezing and stays in the field all winter. You can use the same spot where summer vegetables grew.

Practical tip: Space kale plants 30 cm apart. Seed germinates quickly in August - raising seedlings in trays is easier than direct sowing, giving you height control and better establishment.

Spinach (Spinacia oleracea)

Spinach prefers cool soil. August sowing gives you October spinach ready to pick. Direct sow in rows 20 cm apart. Spinach grows fast - harvest in 40-50 days.

Note: some spinach varieties "bolt" (flower quickly in heat). Choose "slow-bolt" varieties for August sowing: "Bloomsdale", "Tyee", "Lazio".

Radish (Raphanus sativus)

Radish is one of the fastest vegetables. August sowing gives September radishes (25-30 days growth). Direct sow 5 cm apart, rows 15 cm spacing. Radish tolerates partial shade better than many crops, so use spots where afternoon sun fades.

Radicchio and sugarloaf chicory

These bitter greens thrive in light frost climates. Sow August for November and December harvest. They grow slowly in August but embrace cooler autumn temperatures. Sugarloaf can stay in the field even into January.

Flowers for autumn colour

August is also right for some cut flowers and field blooms.

Chrysanthemums (Chrysanthemum spp.): Many chrysanthemum varieties can be sown in August and flower through autumn. They grow fast and give long ornamental value.

Red flowering brassicas: Amaranth seed (Amaranthus) sown in August flowers until first frost. Direct sow in previous season soil.

Soil preparation and sowing technique

Clear away old summer crops and add compost or rich seed compost. August soil temperatures are still warm - water thoroughly if dry. You can sow directly in soil or raise seedlings indoors in trays.

Direct sowing: Scatter seed in thin rows, cover lightly, water gently. Direct sowing works well for radish and spinach.

Raising indoors: Fill seed trays with seed compost, place seed shallowly, water from below. Plant out when 10-15 cm tall (after 3-4 weeks). Indoor raising gives more control and protects seed from rain damage.

Moisture balance in August

August soil dries quickly, even with rain. Direct-sown seed and newly planted trays need daily watering until established. Mulch (dried grass, compost) helps retain moisture.

Frequently asked questions

Can I use the same soil as summer vegetables?

Yes, usually. If you grew tomatoes, cucumbers or peppers, remove them and top the soil with compost for kale, spinach and radish. This prevents depletion.

Isn't August too late?

No. August is early enough. Even sowing end-August (25-31 Aug) gives full autumn growth for October-November. If you want faster harvest, stick to spinach and radish late-month.

How do I care for seedlings in August heat?

Seedlings need shade in August. Indoor in trays, place them in a sunny but protected spot. Outdoors: provide 30-50% shade for the first two weeks (shade cloth or horticultural fleece).

What insects are problems in August?

August is less severe than June-July for many pests. Cabbage fly can still trouble brassicas (kale, broccoli). Use insect netting or close-cover techniques (fleece) for protection.

How does frost make kale sweeter?

Frost breaks down cell walls and converts starch to sugar. This is not a myth. Kale that experiences November frosts tastes noticeably sweeter than October kale. You simply need patience.

Step-by-step

Step 1: Prepare soil (late July to early August)

Remove summer crops. Add compost (5-10 cm). Water thoroughly. Let settle 1-2 weeks.

Step 2: Choose seed and sowing date (5-25 August)

Kale: 10-25 Aug. Spinach: 10-20 Aug. Radish: 15-31 Aug. Radicchio: 1-20 Aug.

Step 3: Sow (direct or in trays)

Direct: Sow in rows, cover lightly, water gently. Trays: Sow in seed compost, place warm and light, water daily.

Step 4: Care through growth (August to October)

Water regularly (daily in dry spells). Mulch for moisture. Weed as needed. No feeding - compost provides.

Let October and November start right

With August sowing, you skip the October rush that exhausts many gardeners. While others are tired, you already have harvestable plants. Enjoy autumn vegetables deep into December.

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Most gardeners plan autumn crops when September arrives. August sowing puts you a full month ahead. Your kale grows while their soil sits empty. This small advantage means October brings full beds instead of waiting until November.

August sowing takes discipline. You must resist the urge to rest in July-August. But the reward - fresh, abundant autumn vegetables from October through January - makes it worthwhile. Start now. Your future self will thank you.

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Plan your August garden

With August sowing you begin your autumn and winter harvest. Use [gardenworld.app](https://gardenworld.app) to visualise your vegetable and flower beds before you sow. Upload your front yard photo, see where crops fit best, and plan your August sowing with confidence. Your autumn starts now.