Planting guide

What to plant in Johannesburg, South Africa in September

Highveld · subtropical highland Southern Hemisphere September

September is when the Highveld wakes up. The last frosts typically pass in the first half of the month, but the summer rains have not arrived yet — so this is a month of two halves: prepare and hold early on, then plant the summer garden into warming soil from mid-September, watering by hand until the storms come.

Plant now

Beans (after mid-month)Phaseolus vulgaris

Direct-sow once frost has clearly passed — they race away in the warming soil.

Sweetcorn (mielies)

Direct-sow in blocks from mid-September for pollination; succession-sow into summer.

Zucchini, squash, pumpkin

Sow after the last frost — they need the full warm season ahead of them.

Tomato and pepper seedlings

Plant out from mid-September; stake at planting and water deeply until the rains start.

Beetroot, carrots, lettuce

Can go in through the month — they tolerate the cool starts.

Timing notes

  • The Highveld’s average last frost falls in early-to-mid September — watch the forecast, not the calendar, before planting tender crops.
  • Spring here is dry: the October rains have not arrived, so everything planted this month depends on irrigation to establish.
  • Use the frosty first half of the month to dig compost into beds — Johannesburg’s summer garden is made or broken by September soil prep.
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