Q When should I cut down agapanthus stalks and can I sow the seed?
GRANT RIVERS, ESSEX
A Agapanthus often set seeds, which can be sown in spring. Once the heads turn brown, cut the old flower stem down to the base and keep it in a cool, dry place until the flat, black seeds drop out. Agapanthus are not true bulbs but plants with fleshy roots and the shoots will divide and produce sideshoots. They resent disturbance, so leave them to form a large clump.