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Sow Summer Vegetables and Spring Clean Your Garden

Got a greenhouse? Is there anything growing in it, or has it become a sad dumping ground for broken garden paraphernalia?

Have a spring clear-out, says Flo Whitaker, take the junk to the recycling centre and make space for some nutritious summer veg! 

Now is the ideal time to sow tender summer vegetables such as tomatoes, cucumbers, aubergines and peppers, (both sweet and chilli types). Frost-sensitive seedlings enjoy the protection of a warm conservatory, electric propagator or heated greenhouse. If you don’t have those, fear not – other methods are available. An airing cupboard may seem an unlikely bit of gardening kit, but the seeds will enjoy the warmth. They require no light during the first stages of germination and won’t mind the dark. Check them twice a day and remove to a bright indoor location as soon as shoots appear. A sunny windowsill makes a good propagation bench – but move pots into the centre of the room overnight. Windowsills are often chilly at night, as cool air is trapped between cold glass and drawn curtains – an unpleasant environment for tender plants.

Don’t sow the entire packet! Ask yourself, ‘How many plants do I actually need?’ If you keep some seeds in reserve, you can always try again if the first sowing fails. Seed trays occupy lots of space on a greenhouse bench and are too wide for most windowsills. Instead, fill a 10cm pot with seed compost, press the surface down lightly and space a dozen seeds on the surface. Scatter a very fine layer of compost or vermiculite on top and stand the pot in a saucer of water for 10 minutes. Allow excess water to drain away and loosely place clear plastic over the top of the pot, removing when seedlings start to show. Germination times can be erratic in spring; 7-14 days is typical. Rotating the pots 90° every day ensures seedlings grow upright, not ‘phototropic’, (leaning towards the light).

When 4cms high, transplant seedlings into individual small pots using multipurpose compost. They’ll need another final potting-on; 20cms pots are ideal for peppers and aubergines; tomatoes and cucumbers need 30cms or larger. Stake plants early using canes and string – remember, developing fruits are heavy. As plants begin to flower, apply a tomato fertiliser at the recommended rate.

If you don’t have a greenhouse or conservatory, all is not lost as some cool resistant summer veg varieties are now available. They’ve been bred to cope with the contrariness of British weather and will crop in a sheltered outdoor spot. Aubergines are the exception to this hardy band – they’ll sulk unless you can offer them continuous warmth under glass. Aubergine seedlings can also be slow to reach maturity. Sowing early extends the growing season, but only do this if you can provide a sustained (day and night) temperature of around 18°C. Alternatively, wait until plantlets appear in the garden centres – let someone else have the hassle of raising them!

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