GreenlyWhen to plant watermelon in Seville
In Seville, watermelon: sow seedlings around 8 February for the greenhouse and around 1 March for open ground; plant into a greenhouse around 12 March; plant out into open ground around 2 April.
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.