Zucchini in April: monthly care

Zucchini (Cucurbita pepo) thrives in full sun and demands rich, moisture-retentive loam. Because it's tender and frost-sensitive (hardy only to zone 10a–12b), you must wait until all risk of frost has passed before planting outdoors in temperate Europe. In practice, this means sowing or transplanting from April through June, depending on your local climate and whether you start indoors or direct-sow. For direct sowing, prepare the soil by digging in plenty of well-rotted manure or garden compost a few weeks beforehand; zucchini are greedy feeders. Sow seeds 2–3 cm deep on their edge (this helps prevent rot) in groups of two or three, spacing each group 100 cm apart to accommodate the plant's eventual 80–150 cm spread. Once seedlings emerge and develop their first true leaves, thin to leave the strongest plant at each station. Alternatively, start seeds indoors in 7–9 cm pots from mid-April, sowing one seed per pot. Keep them on a warm windowsill or in a heated propagator at around 18–21°C. Transplant outdoors in late May or early June after hardening off for a week, again spacing plants 100 cm apart. Immediately after planting or sowing, water thoroughly to settle the soil around roots or seeds. Apply a 5 cm layer of organic mulch around each plant (but not touching the stem) to conserve moisture and suppress weeds. Zucchini have high water needs, so consistent moisture from the outset is essential. In exposed sites, young transplants may benefit from a cloche or fleece for the first week or two until they establish.

Zucchini have high water needs throughout their growing season. Water deeply and consistently, aiming for the soil rather than the leaves to minimise fungal problems. In dry weather from June to September, this typically means a thorough soak two or three times per week; in hot spells, daily watering may be necessary. Inconsistent watering causes fruit to abort or develop bitter flavours, so mulching with compost or straw helps retain moisture and regulate soil temperature. Feed generously. Zucchini are hungry plants, and regular feeding from April through July keeps them productive. Apply a balanced general-purpose fertiliser or liquid tomato feed every two weeks once flowering begins, or side-dress with well-rotted manure or compost monthly. Potassium-rich feeds (such as comfrey tea or tomato fertiliser) support heavy fruiting. Overwintering is not applicable; zucchini are frost-tender annuals that will be killed by the first autumn frost. Clear spent plants in October or November and compost them unless they show signs of disease. Powdery mildew is the most common problem, appearing as white patches on leaves from mid-summer onward, especially in humid conditions or where air circulation is poor. Remove affected leaves promptly and avoid overhead watering. Slugs and snails can devastate young plants; protect seedlings with barriers, beer traps, or organic pellets. Aphids occasionally cluster on shoot tips; squash by hand or spray with soapy water. Blossom end rot—dark, sunken patches on fruit—indicates calcium deficiency or erratic watering rather than disease; maintain even soil moisture to prevent it.