Planting Advice for your cannas:
- Cannas can be planted outdoors or containers. During spring, before planting the canna lily, wait until all threat of frost has passed.
- Groups of cannas should be planted about a foot or two apart.
- While technically they don’t have a top or bottom, canna rhizomes (when supplied bare root) can be planted horizontally with the eyes facing up.
- Cover the rhizomes with 3 to 6 inches of soil.
- Water well and apply a layer of mulch to retain moisture.
- Potted plants can be planted straight out where they are to flower.
Aftercare advice for canna lilies:
- Water freely in dry spells.
- Apply a general-purpose liquid feed in midsummer.
- If temperatures are maintained above 10°C (50°F) cannas will remain in growth all winter and flower occasionally.
- Lift the plants in autumn after the foliage has been frosted. Break large clumps into two or three and pot the pieces into 10in (or so) pots.
- You can then overwinter them in any frost-free shed or greenhouse, keeping them just slightly moist.
When the plants start to push up their red shoots in spring, bring them into a light place, water well and protect them from late frosts.
- By June, growth will be well under way and they can be planted out once more.
Pruning advice for cannas
- Little pruning or training is needed, just stake clumps in exposed positions.
- When a flower spike has no more buds, prune it down to the next side shoot where a secondary flower spike should develop.