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Many types of vegetables can be sown in September, weather permitting.
Once early-sown peas are well up, fortnightly sowings of small quantities of peas can begin, to give crops over a longer period. Peas like good, firm soil, not too heavily manured, with lime added.
Onions can be sown now. Rich ground is required for good growth, so dig rotted manure into the soil with an all-purpose fertiliser. Sow spring onion seed no more than 5mm deep and firm the soil over them.
White and golden turnips and spinach, as well as lettuce, radish and other salad plants, can be sown as soon as the soil is in suitable condition. If mud clings to your boots and garden tools, it is too wet, so wait for sun and wind to dry the soil.
At this time of year, seeds can be sown quite shallowly, to a depth of about twice to three times their size, as it is unlikely they will dry out before getting established.
Brussels sprouts need a long growing season and should be the first winter vegetable sown. Sow thinly in a warm spot and thin if necessary when the seedlings have developed two or three true leaves.
Leeks, which also need along growing season, can be sown this month for planting later. It is too early to sow celery outdoors, but seed can be put into trays of seed-raising mix in an unheated glasshouse.
Pumpkin, marrow, cucumber and tomato seeds can be sown in seed trays or pots in a heated glasshouse or a warm spot indoors for planting out in late October to early November, once all danger of frost has passed.
Hardy annuals for the flower garden can be sown now and again next month. Sow them where they will flower, then thin as they grow. Poppies, candytuft, larkspur, godetia, cornflower, mignonette, clarkia, sweet sultan and scabious grow happily in average soils. Half-hardy annuals, such as zinnias, asters and bedding dahlias (actually a perennial) sown under glass for planting out in November should have germinated now. However, there is still time to sow seed. Cowslips (Primula veris), polyanthus and primulas are easily raised from seed sown now, and will flower next spring.
The word cowslip comes from an old word for cowpat, as cowslips would grow alongside cow manure in English meadows. That indicates how fond members of the primula family are of manure, and an old practice was to empty the chamber pot over polyanthus plants. History does not record whether the flowers were taken indoors!
Sow primula seed thinly in seed-raising mix. Cover with a sheet of glass, then a sheet of cardboard. Keep the soil moist and seedlings will appear in three or four weeks. When they are large enough to handle, lift the seedlings out and plant where they can enjoy summer shade in the middle of the day. Transplant to their flowering position in late autumn.
New growths of fuchsias, fibrous-rooted begonias, abutilons and other plants can be cut off at this time of year and put into pots of moist, sandy soil to strike new plants.