Swiss Chard in May: monthly care

Swiss chard thrives in full sun or partial shade and tolerates a wide range of soils, though it performs best in moisture-retentive loam or clay. Before sowing or planting, prepare the bed by digging in plenty of well-rotted compost or manure to improve soil structure and fertility. The soil should be firm but not compacted, with a pH between 6.0 and 7.5. You can sow chard directly outdoors from April through to July, allowing for successive harvests throughout the growing season. Sow seeds 2–3 cm deep in drills spaced 30–40 cm apart. Each chard "seed" is actually a cluster, so several seedlings may emerge together; thin these to a final spacing of 25 cm once they're large enough to handle. Alternatively, sow indoors in modules from March onwards and transplant seedlings out after hardening off, spacing them 25 cm apart in rows. Water the drill or planting holes thoroughly before sowing or transplanting, especially in dry weather. After planting, water gently to settle the soil around the roots. Keep the soil consistently moist during the first few weeks to encourage strong establishment. Chard is relatively fast-growing and doesn't require staking, but a light mulch of compost or well-rotted manure around the base of young plants will help retain moisture and suppress weeds. Avoid planting too early in cold, wet soil, as this can lead to bolting later in the season. For the best leaf quality, choose a spot with some afternoon shade in midsummer, particularly if your soil tends to dry out quickly.

Swiss chard is a low-maintenance vegetable once established, but consistent watering is crucial for tender, succulent leaves. Water regularly throughout the growing season, aiming to keep the soil evenly moist but not waterlogged. In dry spells, water deeply once or twice a week rather than little and often, directing water at the base of the plants to avoid wetting the foliage. Chard grown in clay soil will need less frequent watering than plants in lighter ground, but don't let the soil dry out completely or leaves will become tough and bitter. Feed plants in May and June with a balanced liquid fertiliser or apply a top-dressing of pelleted poultry manure to support vigorous leaf growth. Avoid high-nitrogen feeds later in the season, as these can encourage soft, sappy growth that's more vulnerable to pests and disease. A mulch of garden compost applied in early summer will help retain moisture, suppress weeds, and provide a slow release of nutrients. Chard is generally trouble-free, but watch for aphids on the undersides of leaves and leaf-mining flies, which create pale, winding tunnels in the foliage. Pinch out affected leaves promptly. Slugs and snails can damage young plants, so protect seedlings with barriers or organic pellets. Birds occasionally peck at the colourful stems; netting may be necessary if this becomes a problem. Chard is hardy to around -5°C and will often survive mild winters, particularly if given a fleece covering during hard frosts. In colder areas, plants may die back but can resprout in spring if the crown remains undamaged.