Every purchase supports the work of the RHS Every purchase supports the work of the RHS
  • semi-cactus dahlia tuber
  • Eventual height: 1.2m
  • Eventual spread: 0.5m

Dahlia 'Purple Gem'

semi-cactus dahlia tuber

£3.99 £1.60
60% off dahlia bulbs
Pot size 1 tuber
1 tuber
Quantity
  • Position: full sun
  • Soil: fertile, humus-rich soil
  • Rate of growth: average
  • Flowering period: July to October
  • Hardiness: half hardy

    This rich-purple, cactus-shaped dahlia will flower from midsummer to mid-autumn, particularly if the spent flowers are removed promptly - or you cut them fresh for the vase. The magnificent flowerheads look incredible when mixed with rich plums, deep purples and near-black.

  • Garden care: Dahlia tubers can be planted outside after frost, or started off in pots under glass in late winter to early spring. Plant them horizontally approximately 12cm deep, making sure the ‘eyes’ are uppermost. Allow enough room between each tuber so the plants can grow and spread to their full size without being over-crowded. While in growth, provide a high-nitrogen liquid feed each week in June, then a high-potash fertiliser each week from July to September. Stake with canes or brushwood if it becomes necessary. In mild areas, leave them in situ over winter, but protect the crown with a generous layer of dry mulch. In colder areas, carefully lift and clean the tubers once the first frosts have blackened the foliage and allow them to dry naturally indoors. Then place the dry tubers in a shallow tray, just covered with slightly moist potting compost, sand or vermiculite and store in a frost-free place until planting out again.
  • CAUTION do not eat ornamental bulbs
Share

Goes well with...

  • Terracotta bulb bowl
    Terracotta bulb bowl
    £19.99 £16.99 Buy
  • Bell terracotta lavender pot
    Bell terracotta lavender pot
    £44.99 £38.24 Buy
  • Terracotta citrus pot
    Terracotta citrus pot
    £49.99 £42.49 Buy
  • Bulb starter with rootgrow
    Bulb starter with rootgrow
    £5.99 Buy
  • Taylors bulb fibre
    Taylors bulb fibre
    £3.49 Buy