“`html
Growing Agapanthus in Containers
Container grown Agapanthus are ideal for patios, courtyards and sunny garden positions. Plant one Agapanthus per container, as the roots quickly fill the pot. Agapanthus flower best when slightly rootbound, so avoid using an excessively large container initially. Potting on gradually into slightly larger pots encourages reliable flowering year after year. If preferred, you can plant directly into a large decorative container, but flowering may be delayed until the roots have established fully.
For best results, place a layer of polystyrene packing chips in the base of the pot to improve drainage and provide insulation. Cover the chips with a few sheets of newspaper before adding compost. Plant the Agapanthus, leaving a 2-5cm (1-2 inch) gap below the rim of the container. A top dressing of dark-coloured decorative pebbles helps retain warmth and moisture around the roots.
Position containers in the sunniest part of the garden. Agapanthus thrive in a warm, sheltered location with full sun and preferably a south-facing aspect.
Container grown Agapanthus can be planted at any time of year. During winter, newly potted plants should be protected from severe frost by moving them to a sheltered location, greenhouse or unheated conservatory.
Best Potting Compost for Agapanthus
Both soil-based and peat-based composts can be used successfully for growing Agapanthus in containers.
- Soil-based compost: add approximately 10% horticultural grit by volume.
- Peat-based compost: add approximately 10% horticultural grit and a suitable slow-release fertiliser according to the manufacturer’s instructions.
Firm the compost gently around the roots and tap the container lightly to settle the compost without compacting it. Water thoroughly until water drains freely from the base of the pot.
Agapanthus Watering Tips
A simple holiday watering system can be made using a 1 or 2 litre plastic drinks bottle. Pierce a small hole in the cap, fill the bottle with water and replace the cap. Insert the bottle upside down into the compost. This creates a slow-release watering system that can help keep the compost moist for several days depending on weather conditions.
If you wish to slow the flow further, partially block the hole with a small screw.
Feeding Container Grown Agapanthus
If a slow-release fertiliser has been incorporated into the compost, additional feeding may not be required for up to 12 months. Otherwise, feed every two weeks from May to September using a balanced liquid or soluble fertiliser.
Avoid overfeeding, as excessive fertiliser can reduce flowering and encourage soft, leafy growth.
Common Agapanthus Pests
The most serious pest affecting container grown Agapanthus is vine weevil. The creamy-white grubs with brown heads feed on the fleshy roots beneath the compost surface, often causing significant damage before symptoms become visible above ground.
Vine weevil control products are available as compost additives, granules and liquid treatments. Regular inspection of containers can help detect problems early.
Slugs and snails may also damage foliage, particularly young growth in spring. Checking plants regularly and removing pests by hand remains one of the most effective control methods. For further advice, see our guide on preventing slug and snail damage.
“`