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An underground storage organ comprising a short, swollen portion of stem protected by a layer of skin known as a tunic. Corms are planted like bulbs.
.Bulbs need enough time in the cold and dark for the root system to develop and support flowering. Use a thermometer to ascertain that your shed or garden is cold enough (it should be around 10°C). Once inside, place the bulbs or corms in a cool, north
or conservatory to plant outdoors again next season. SecateursBamboo canesStringHorticultural fleece or bubble polytheneStrawChicken wireLarge flower pot or crateBark chippings mid-October - early December 20 minutes per plantProtect palms by tying in the leaves
The loose, outer covering of a corm or bulb.
Learn how to plant colchicums, and pick up advice on soil enrichment, drainage and corm planting depth, in Chris Bearshaw's video guide.summerMore advice on plantingHow to plant in wavesGrowing dahlias from seedBrowse a variety of crocuses
of gladioli corms in bordersGive azaleas and acid-loving shrubs a generous feed with acidic (ericaceous) fertiliserPlant out sweet pea seedlings sown last autumnSupport oriental poppies with canes to prevent them flopping
and foodSprinkle an all-purpose fertiliser along the base of hedgesMove patio pots to sheltered sites during extremely cold periodsOrder bulbs, corms and tubers for summer flowers, including dahlias, canna lilies, gladioli, eucomis and lilies
Plant bulbs, corms and tubers like achimenes, begonias, gloxinias in potsSow coleus and other houseplantsWatch out for pests, like whitefly and red spider mite, and treat at oncePut a mouse trap in your greenhouse if you find seeds and plants being
Sow cyclamen and schizanthus for indoor flowersBuy scented-leaf pelargoniums, such as 'Chocolate Peppermint' and 'Lady Plymouth' Plant pots with heat-treated freesia corms to produce fragrant flowers this summerWatch out for pests, checking under leaves
, chaenomeles, pyracantha and kerriaRegularly water newly planted trees, roses, shrubs and hedging Finish planting out gladioli corms in groups or drifts in bordersSpread shredded bark mulches around established shrubs and trees to conserve soil moisture