Seeds (Cucurbita pepo var. cylindrica)

The Yellow Zucchini (Cucurbita pepo var. cylindrica) sets it apart with its bright, glossy golden-yellow skin and a slender, straight, cylindrical fruit that lights up any plate. Its pale, fine-grained flesh is mild and tender with a gentle sweetness, and the colour holds beautifully when grilled, sautéed, or shaved raw into salads. Picked while small and firm, it is among the most decorative and versatile of summer squashes, just as at home in a quick stir-fry as it is roasted or spiralised.

Planting

This is a warm-season, frost-sensitive crop, so sow only after all danger of frost has passed and the soil has warmed. Aim for a soil temperature of at least about 21°C at 5 cm depth, with 18-21°C giving the best germination. You can also start earlier indoors and transplant after hardening off, sowing about 3 weeks before transplanting in 7.5 cm containers. Sow seed roughly 1.3-2.5 cm deep, around 13 mm deep in pots and about 2.5 cm deep outdoors. In warm soil seeds come up quickly, usually within about 5-7 days. These are large, vigorous plants, so give them room: space about 90 cm apart, or roughly 60-90 cm between plants with 90-150 cm between rows. Sow a few seeds per spot, then thin to the strongest plant, leaving seedlings about 20-30 cm apart, and cut the extras off with scissors rather than pulling so you do not disturb the roots.

Fertilizing

Grow in fertile, well-drained soil and work in compost or fertilizer before planting. The plant prefers a slightly acidic soil with a pH of about 6.0-6.8. Once the vines begin to spread, side-dress with nitrogen; another good moment to feed is when the female flowers begin to appear. For plants grown in containers, feed every 10-14 days with a high-potash liquid fertilizer once the first fruits start to swell, while plants in good garden soil generally do not need extra feeding.

Care

Give the plants full sun, at least 6 hours of direct light a day, ideally 8-10 hours, in a warm, sheltered position. They are thirsty and heavy water users: provide about 2.5 cm of water per week, and in hot weather they may need watering daily. Drip lines or soaker hoses are best, and keeping the foliage dry helps limit disease. Watch for squash vine borers, squash bugs, striped and spotted cucumber beetles (which can spread bacterial wilt), as well as slugs and snails on young plants. Powdery mildew is the main fungal problem, along with downy mildew, cucurbit viruses, anthracnose, angular leaf spot, bacterial wilt, and grey mould. This is a fast crop, maturing in about 50-65 days from transplant. Harvest the fruit young and tender, before the seeds enlarge and the skin hardens, picking when about 10-20 cm long, and harvest often, 2-3 times a week, to keep the plants productive.

Growing in Egypt: With no real frost risk across most of the Nile Valley and Delta, the aim is matching warm but not extreme temperatures. In the Nile Delta and Lower Egypt, sow a main spring crop in February-March as the soil warms, or an autumn crop in August-September for an October-November harvest. In the warmer south of Upper Egypt, sow earlier in January-February for a harvest before the intense summer, or in September for a cooler-season crop, and avoid the peak heat of June-August. Protected tunnels or greenhouses can extend the season into winter throughout the country.