Crop Rotation Group
Miscellaneous
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Soil
Fertile, well-drained soil enriched with compost, with a slightly acidic pH.
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Position
Full sun to partial shade.
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Frost tolerant
Most agapanthus tolerate cold to about 20°F (-6°C), with a few cultivars like ‘Little Galaxy’ hardy to -5°F (-20°C). In cold winter climates, container-grown plants can be brought indoors in winter.
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Feeding
In spring, topdress deciduous agapanthus with rich compost. Drench plants grown in containers with a liquid organic fertilizer monthly during the summer months.
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Companions
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Spacing
Single Plants: 11" (30cm) each way (minimum)
Rows: 11" (30cm) with 11" (30cm) row gap (minimum)
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Sow and Plant
Set out container-grown agapanthus in spring after the soil has warmed. This is also the best time to dig and divide crowded clumps. Set plants so that the tops are covered by 1 inch (2.5 cm) of soil. Young plants need water when they are actively growing, but avoid keeping the plants too wet. When grown in the ground, agapanthus need dividing only every five years or so. Plants may skip a year of blooming after being divided.
Our Garden Planning Tool can produce a personalized calendar of when to sow, plant and harvest for your area.
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Notes
Native to South Africa, agapanthus is a valuable source of cool blue in the summer garden. In semi-tropical areas they make great low maintenance landscape plants, with strappy green foliage that persists year-round. Where winters are cold, grow agapanthus as indoor-outdoor houseplants. If you don’t have a sunny indoor spot for your potted agapanthus, you can let it rest in a cool basement through winter.
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Harvesting
Agapanthus make fantastic cut flowers, and cutting may help extend bloom time.
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Troubleshooting
Agapanthus thrive in humid heat and may struggle to grow where nights are cool. They have few problems with pests and diseases.
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