How to Grow Dahlia Bulbs


  • Sowing Instructions
  • Where to Position
  • Maintaining Your Dahlias

Sowing Instructions

  • When to sow: Plant bulbs out in March, April or May
  • Avoid planting out before the last frost
  • Soil Preparation: Prepare soil by adding well rotted farm yard manure
  • You can also add grit or vermiculite to the base of the hole to improve drainage
  • Planting hole should be 30cm (1 ft) deep to allow for good drainage
  • Plant with pointed end (eye) pointing upwards
  • Depth: Plant tubers approx 3 times their size deep
  • Spacing: 75cm apart

Where to Position

  • Position in full sun, where bulbs will get at least 6 hours of sunlight each day
  • Avoid frost pockets & exposed locations
  • Dahlias are happy in most soils, but good drainage is important to prevent tubers from rotting

Maintaining your Dahlias

  • Because dahlias are tender you should lift the bulbs each Autumn
    • Clean, dry and store the bulbs indoors
    • Store in a cool, dry and dark location
  • Water well after planting & keep moist in the Summer months
  • Feed every 2 weeks with a general purpose plant food
  • As dahlias are shallow rooted, taller varieties will need staking
  • If using plant support rings, position the rings before the Dahlia has grown tall
  • Deadhead old flowers as they fade
  • As you will be lifting your bulbs every Winter, you can divide them periodically
    • Divide clumps of bulbs every 3 years

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