Solomon's seal in March: monthly care

Solomon's seal (Polygonatum × hybridum) thrives in partial to full shade, making it an excellent choice for woodland gardens, shady borders, or beneath deciduous trees. It tolerates a range of soils but performs best in moisture-retentive loam or clay that doesn't dry out completely in summer. Avoid planting in hot, sunny spots or very dry, sandy ground. Plant rhizomes in March, April, September, or October, when the soil is workable and temperatures are mild. Autumn planting is often preferable because it allows the roots to establish before winter, but spring planting works well if you keep new plants watered through their first summer. Dig a hole about 5–8 cm deep and lay the rhizome horizontally with any growing points facing upwards. Space plants 40 cm apart to allow the clumps to expand gradually over the years without crowding. Before planting, improve heavy clay by forking in garden compost or well-rotted manure to aid drainage, though Solomon's seal tolerates clay better than many perennials. In lighter soils, add organic matter to boost moisture retention. After planting, firm the soil gently around the rhizome and water thoroughly to settle it in and eliminate air pockets. Apply a 5 cm layer of leaf mould, garden compost, or bark mulch around the planting area to conserve moisture, suppress weeds, and mimic the plant's natural woodland floor habitat. Keep the mulch clear of emerging shoots in spring. Water regularly during the first growing season if rainfall is sparse, especially in late spring when the arching stems and foliage are developing rapidly.

Solomon's seal is genuinely low-maintenance once established. Water regularly during prolonged dry spells in spring and summer, particularly in the first year and when the plant is in active growth from April to June. The arching foliage can wilt if the soil dries out completely, though established clumps tolerate short dry periods better than newly planted rhizomes. In autumn and winter, natural rainfall is usually sufficient. Feed in March or April as new shoots emerge. Scatter a general-purpose granular fertiliser such as blood, fish, and bone or a balanced slow-release feed around the base of each clump, then water in if rain isn't forecast. Alternatively, apply a 3–5 cm mulch of garden compost or well-rotted manure in early spring; this feeds the soil, conserves moisture, and mimics the leaf litter Solomon's seal enjoys in the wild. Avoid high-nitrogen feeds, which promote soft growth at the expense of flowers. The plant is fully hardy to zone 4 and needs no winter protection in temperate Europe. The rhizomes remain dormant underground until spring, when new shoots push through in March or April. The most common pest is the Solomon's seal sawfly (Phymatocera aterrima). The grey larvae strip foliage to skeletons, usually in late spring or early summer. Check the undersides of leaves from May onwards and squash any larvae by hand, or spray with an insecticide suitable for caterpillars if infestations are severe. Sawfly damage is unsightly but rarely fatal; plants recover and return the following year. Clearing away old stems in November helps reduce overwintering pupae. Slugs occasionally nibble emerging shoots in spring; use your preferred slug control if damage is significant.