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To begin with you will need a container of at least 18 inches wide and approximately 25 litres in volume - the bigger the better! Fill the bottom third of the container with well-rotted farm manures and the rest with a good quality soil-based compost such as John Innes 'No 3'.
To make a head start on the season you can sow your courgette seed under protection inside in March and April. Using 3 inch pots containing John Innes 'Seed and Cutting' sow one seed per pot no more than 1 cm deep. Place the pots inside a heated propagator at a temperature of between 20-25 Celsius and keep on a warm, bright windowsill, but one that does not receive direct sunlight. If you do not have a heated propagator then seal the pots inside a clear polythene bag.
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You can plant courgette seed directly into their containers during May and June, but again only once the threat of late frosts have passed. Germination will usually take about 8 – 18 days.
Place your container in a sunny, warm position and place a layer of dry mulch (bark chips or gravel) on the surface. Continue to keep the compost moist and do not allow it to dry out - particularly in hot dry weather.
As soon as the courgettes begin to form begin to feed with a liquid soluble fertilizer every 10-14 days.
Courgettes will be ready to harvest as so as they are 6″ long by cutting them off at the stalk with a sharp knife.