How to Grow Solomon's Seal
Polygonatum multiflorum
Solomon's seal is a graceful woodland perennial with arching stems bearing pairs of dangling white bell-shaped flowers in late spring. It thrives in shade or partial shade in moist, humus-rich soil — ideal under trees and shrubs. Virtually maintenance-free once established. Watch for Solomon's seal sawfly larvae which can strip the foliage in early summer.
Yearly Lifecycle
Care Essentials
Mulch with leaf mould or well-rotted compost in autumn. No additional feeding needed — it thrives in naturally humus-rich woodland soil.
Watch For
- Solomon's seal sawfly larvae stripping leaves in June
- Slugs on emerging shoots in spring
- Grey mould in very damp, stagnant conditions
Track your Solomon's Seal care schedule — pruning, feeding, and seasonal tasks
Start planning freeCare Requirements
☀️ Light
Shade to partial shade
Solomon's seal thrives in dappled shade under trees and shrubs. It tolerates deep shade but produces fewer flowers. Avoid full sun, which scorches the leaves and causes wilting.
💧 Watering
Moist but well-drained soil; little supplementary watering needed
In its preferred woodland position, natural rainfall is usually sufficient once established. Water during prolonged dry spells in spring and early summer when growth is active. Established clumps are surprisingly drought-tolerant in shade.
🌱 Fertilizing
Annual autumn mulch; no additional feeding required
Apply a generous layer of leaf mould or well-rotted garden compost around the base in autumn. This mimics the natural woodland leaf litter and provides all the nutrients the plant needs. Chemical fertilisers are unnecessary.
✂️ Pruning
Cut to ground level in autumn after foliage dies back
No pruning is needed during the growing season. In late autumn, once the stems have yellowed and collapsed, cut them to ground level. No other intervention is required.
❄️ Overwintering
Fully hardy; no protection needed
Solomon's seal is fully hardy throughout the UK (RHS H7) and dies back naturally each autumn. The rhizomes overwinter safely in the ground without any protection. Do not be tempted to mulch for warmth — this is unnecessary and can encourage slug activity.
Growing Tips
Don't disturb established clumps
Solomon's seal takes 2–3 years to settle and spread into an impressive colony. Digging and dividing too early sets it back significantly — leave clumps undisturbed unless they have genuinely outgrown their space.
Watch for sawfly from May
Solomon's seal sawfly (Phymatocera aterrima) can strip a plant bare within days. Check leaf undersides from May onwards and pick off the grey-white larvae by hand immediately — daily inspection in June is worthwhile.
Autumn cut-back feeds the rhizomes
Once the foliage yellows and collapses in autumn, cut all stems to ground level and apply a mulch of leaf mould. This tidy-up also returns nutrients to the rhizomes for the following year's growth.
The berries are poisonous
The attractive blue-black berries that follow the flowers in late summer are toxic if eaten. This is worth noting if the plant is grown in a garden used by young children.
Pests & Diseases
Pest Solomon's Seal Sawfly
Identification: Grey-white caterpillar-like larvae (up to 2 cm) on leaf undersides from May–July. Leaves are eaten from the edges inward; a severe attack can strip a plant completely bare within days.
- Pick larvae off by hand and drop into soapy water — this is the most effective control.
- Spray with an organic pyrethrin-based insecticide if hand-picking is not practical on a large planting.
- Spray with a contact insecticide containing deltamethrin or lambda-cyhalothrin, covering leaf undersides thoroughly.
Pest Slugs
Identification: Irregular holes in emerging shoots and young leaves in spring. Slime trails visible in the morning. Most damage occurs at night or after rain.
- Apply a ring of sharp grit or crushed eggshell around emerging shoots in spring.
- Use nematode-based biological control (Phasmarhabditis hermaphrodita) drench in spring when soil is above 5°C.
- Hand-pick at night with a torch.
- Ferric phosphate slug pellets are wildlife-safe and effective when scattered sparingly around shoots.
Disease Grey Mould Botrytis cinerea
Symptoms: Fluffy grey mould on stems or leaves, usually in crowded or poorly ventilated spots. Affected tissue collapses and turns brown.
Treatment: Remove affected stems and leaves immediately. Improve air circulation by thinning crowded growth. Avoid overhead watering.
Prevention: Plant at the recommended spacing of 40–50 cm. Clear away dead foliage promptly in autumn. Avoid working around plants when the foliage is wet.
Disease Leaf Spot Ramularia sp.
Symptoms: Brown or grey circular spots on leaves, sometimes with a darker border. In severe cases spots merge and leaves yellow and drop prematurely.
Treatment: Remove and destroy affected leaves. Avoid wetting the foliage. In severe cases apply a copper-based fungicide.
Prevention: Good air circulation and avoiding overhead irrigation reduce incidence. Clear all fallen leaves in autumn to remove overwintering spores.
Log Solomon's Seal in your garden — track growth, care, and harvests year after year
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