Some of the most popular house plants are grown from tender bulbs. By keeping to their natural cycle of rest and growth, you’ll get colourful blooms year after year. By choosing carefully, you can have tender bulbous house plants in flower all year round. On the, tender bulbs add late summer and autumn colour, to follow the early summer colour of herbaceous perennials.
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How bulbs work
Bulbs store food and water during a plant’s active growth, so it can survive a long period of rest, or dormancy. If youand water a bulb all year round, you’re not being kind but preventing dormancy and harming the plant.
Thecycle usually consists of growing , flowering, dying back, resting and starting up again. Exceptions include and Nerine flexuosa, which flower before leaves appear; and and some , which are evergreen.
Not all bulbs grown as house plants are tender— plants such as, Tulip and are grown from . If you have bulbs of which you are unsure, check with a nursery.
The best time to pot dormant bulbs varies from plant to plant, and also according to whether natural or forced flowering is wanted. Pot up specially prepared Christmas-floweringin early November; in December, for in late winter; and in February, for in spring. Pot Cape Cowslip, Nerine flexuosa and in summer, most Haemanthus in spring, Sprekelia in February, and Easter Lily and Forest Lily in autumn.
Use a soil-basedmixture, and just large enough to hold the bulb. For large bulbs, such as Hippeastrum, use a 12.5-15cm (5—bin) pot. For small bulbs, such as Cape Cowslip, plant 5 or 6 in a 12.5cm (5in) pot.
Haemanthus, Sprekelia, Cape Cowslip, Nerine flexuosa and Scarborough Lily like their ‘necks’ above themixture. Leave the top half of Hippeastrum and Forest Lily bulbs exposed. Cover Easter Lilies with 5cm (2in) of potting mixture, and keep dark, cold and just moist until growth appears.
Most bulbs flower best when slightly pot-bound, so repot every 3-4 years. Between repottings, top-dress Hippeastrum and Haemanthus when starting into growth. Carefully scrape away the top 1.5cm (1/2in) of potting mixture, and replace with fresh.
Bulbs never like being waterlogged, even in full growth. Let the potting mixture dry out a little between waterings, but give Easter Lily, Forest Lily and Cape Cowslip steadily moist potting mixture. Use tepid, not cold, water. After flowering, water moderately until the leaves start to turn yellow, then gradually reduce. During dormancy, water very sparingly—just enough to keep the bulb from shrivelling. Evergreen bulbs need a bit more water when resting, and keep Forest Lily bone-dry. To start bulbs into growth, water sparingly until growth is well under way, then gradually increase the watering.
Feed most bulbs every 2 weeks when actively growing. Start 2 weeks after the first full watering, and continue until after flowering, then switch to a potash-high fertilizer for 6-8 weeks, or until the leaves start to die back. StartHippeastrum after flowering and continue feeding until the autumn.
Most bulbs naturally produce offsets, or bulblets. These emerge from around the base of the mother bulb and gradually become small bulbs. The easiest way to make more plants is to remove the bulblets when repotting, and pot them up separately. Treat as you would the mother plant, but it may take a couple of years for the bulblets to reach flowering size. This is still quicker than raising from, which can take up to five years.
Cover Easter Lily hulk with 5cm (2in) of. Hippeastrum and Forest Lilies like to be half-exposed, while Cape Cowslip, and Scarborough Lily like only their necks exposed.
Potting large bulbs
To flesh out shrivelledof Hippeastrum, soak them overnight in a shallow dish of water. This will also help to promote growth in the bulb. Plant a Hippeastrum bulb in soil-based compost in a pot just large enough for it. Provide broken pot rubble in the base of the pot for good .
- Forest Lily ( Veltheimia)
- Nerine (Nerine flexuo.sa)
- Easter Lily (Lillian longi(larion)
- Guernsey Lily (Nerine surniensis)
- Pineapple Flower
- Sea Lily (Ptincratilim)
- Spider Lily
- Summer Hyacinth (Cialtonia)
- Cape Cowslip (Lachenalia)
- Cape Cowslip
- Easter Lily (Lilium longillorum)
- Forest Lily (Veltheimia) Haemanthus Hippeastrum
- Scarborough Lily (Valium)
- Easter Lily
- Scarborough Lily
Haemanthus, or, can be made to flower between spring and autumn. It must be grown from .
The very popularcan be propagated by rooting the bulbs either on moist pebbles or in potting compost.
I managed to keep my Easter Lily alive, but the second year’s flowers were disappointingly small. What did I do wrong?
Nothing. It is better to discard or plant Easter Lilies in the garden after forcing, as they can’t be forced again.
My friend’s Hippeastrum flowers much earlier than mine everyyear. Why?
The warmer the room, the earlier you can start it into growth. For Christmas flowering, 21°C (70°F) is needed; for late winter flowering, 13°C (55°F); and for spring flowering, 10°C (50°F).