Agapanthus 'Glamis Castle'

Spring · Outdoors

Apply an organic mulch

Apply a 5-10cm layer of organic mulch around the plant in spring to reduce weeds, retain moisture and keep roots cool in summer. Leave a 10cm gap between the stem and the mulch to prevent stem rot. Before applying mulch, clear the area of weeds and water if it hasn't rained recently. Use biodegradable material such as garden compost, well-rotted manure, leaf mould or bark chippings as mulch.

A mulch is a covering that can: protect the soil surface from rain, heat and cold; deter weeds; provide nutrients. Organic indicates that material has vegetative origin e.g. manure, compost. Synthetics i.e. plastics, or stones are often called mulches.

Spring-Autumn · Outdoors

Water to keep the soil moist

For best results, this plant needs soil that is always moist. Water deeply and regularly as soon as soil appears dry. Even for established plants in the ground, a dry week can cause problems with some soils. Check plants in pots more often, especially in hot weather. Or install an automatic irrigation system which will do the hard work for you, even when you are away on holiday.

Without regular watering some plants never fully regain their beauty.

Spring · Planting

Divide when too large

The plant can be divided in alternate years. Clumps may be divided into two or more pieces. Rhizomes can be cut whilst small bulbs or offsets are detached. The new plants can be grown in a container or planted in the ground.

Spring-Autumn · Planting

Success with Agapanthus flowers

Agapanthus need a sunny position. The roots like to be constrained, not congested and the planting pot or hole just big enough for the root ball. Water and feed regularly, even after flowering. The number of flowers will depend on the variety.

Spring-Autumn · Planting

Deadhead Agapanthus after flowering

Cut flowering stems down to the base after the flowers fade. You can leave a few to develop seedheads for additional interest if you like this look.

Summer - early · Outdoors

Apply slow release fertiliser

Apply a slow release fertiliser which is spread around the root area of the plants soon after they have come into growth. (Or apply a liquid feed at regular intervals throughout the growing season.)

This is a simple way to provide a nutrient boost as a single annual procedure.