Top tips for summer-flowering bulbs
Lilies, dahlias, cannas and begonias are all coming into their own now. Experts share some advice for looking after them
Your summer-flowering bulbs should be well on the way to blooming now, bringing a riot of colour to the garden and adding fragrance and form to patio planting.
Lilies, dahlias, cannas and begonias can look amazing as stand-alone specimens in pots, while some can be successfully combined with other garden plants. Most summer bulbs are sun-lovers and ideal for patio pots.
Experts from the Flower Council of Holland, have come up with tips to look after some of their favourite bulbs: the Zantedeschia, hybrid potted lilies and the star of Bethlehem.
Place in sun or shade. The temperature does need to remain above at least 5-8 degrees C, but that won’t pose a problem in the summer.
Don’t let the soil dry out. Water regularly, particularly when the plants are placed in pots or containers. The bulbs and tubers will survive through a slightly drier period, which is handy when you go on holiday for a week.
Feed them once a fortnight to ensure lavish flowering.
Bring summer-flowering potted bulbs indoors after flowering, in October or November, to give them a hibernation period during which the plant remains dry and the foliage dies back. The bulbs and tubers will then produce plenty of new flowers during the next growing season. You can plant them outside again from April onwards.
Tuberous begonias like to be sheltered from wind, in partial shade, as the foliage can scorch in bright sunlight. They’ll also need to be fed regularly with a high-potash fertiliser. And make sure you deadhead them as they fade, to keep the plant going.
If you want them to last through to the next season, store them in a frostfree place over winter. Once they’ve finished flowering, gradually stop watering them and they will die down. Cut stems down and lay the pots on their sides in a cool airy place, or take the tubers out and store them in dry compost until spring, when they should come back to life again.
Plant dahlias in late spring outside in John Innes No. 3 compost in containers at least 30cm in diameter. Encourage bushy growth by pinching the tops out when the shoots reach 10-12cm, and deadhead as they fade to encourage a long succession of flowers. Dahlias will be knocked back by the first frost, so once the top growth has gone, you can remove tubers from the pots, dry them and store them in a frost-free place until spring.
Lilies in pots, planted in spring. Many will be ready to flower in July and benefit from an occasional liquid feed with a high-potash fertiliser. Once blooms have faded, cut them off, but leave the stems and continue to water and feed to build up the bulbs’ strength for next year. The stems will die back naturally in late summer or autumn, and the bulbs can be left in the same pots for a few years. Then, replant them in fresh compost or in the border.
Summer-flowering bulbs such as canna lilies and begonias can look amazing in pots on their own or combined with other garden plants