GreenlyWhen to plant zucchini in Johannesburg
In Johannesburg, zucchini: sow seedlings around 29 June for the greenhouse and around 20 July for open ground; plant into a greenhouse around 31 July; plant out into open ground around 21 August.
Last spring frost around 4 August, first autumn frost around 5 June. Frost-free days: 305 days.
The dates follow the Greenly calendar: open ground a week after the last frost once the soil is warm enough for the crop, frost-hardy crops three weeks before it, an unheated greenhouse three weeks earlier, seedlings sown so they are ready on the day. In a cold year allow a week or two more.