What to do during December in your garden and greenhouse.

Your monthly gardening checklists

Flowers

Prune climbing roses before February

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Fruit and veg

  • Place straw around the base of parsnips to prevent the soil freezing, which can make harvesting difficult
  • Plant blackberries, such as thornless 'Loch Ness', for easy pickings of large, sweet, juicy fruits
  • Winter prune large fruit trees, such as apples and pears, to control their shape and size, and to increase their productivity
  • Plant fruit trees trained as cordons, fans or espaliers to make good use of limited space
  • Start to plan next year's crops and order seeds
  • Tidy up raspberry and blackberry beds – weed and mulch with compost, then tie new stems to support wires
  • Lift and divide large clumps of rhubarb, replanting the outer sections into soil enriched with well-rotted manure
  • Keep kale, winter cabbages and other brassicas covered with netting to protect them from hungry pigeons
  • Finish clearing old crops and debris from the veg plot, but only compost healthy material
  • Remove yellowed leaves on brassicas, so fungal diseases such as grey mould and downy mildew don't take hold
  • Make sure Brussels sprouts don't topple over in strong winds - tie to a cane for support and earth up the stems
  • Prune grapevines, cutting back side-branches to one or two buds from the main stem

Cut back grapevines

Greenhouse

  • Pot up a clump of rhubarb and place under a large bin to force an early crop of sweet stems
  • Pick faded leaves and dead flowers regularly from plants overwintering in the greenhouse, such as pelargoniums
  • Pinch out the tips of autumn-sown sweet peas to encourage bushier growth
  • Deadhead indoor azaleas, water regularly and provide cool conditions, away from radiators, to prolong flowering
  • Monitor greenhouse temperatures with a max-min thermometer to ensure heaters are working efficiently
  • Bring hyacinths growing in the greenhouse into your home to flower, placing in a cool, bright spot
  • Water plants sparingly to keep the greenhouse as dry as possible, which should reduce outbreaks of disease
  • Prune greenhouse grapevines while dormant
  • Water florists' cyclamen (Cyclamen persicum) from below, and deadhead regularly to encourage more blooms
  • Check overwintering plants in the greenhouse for red spider mite and other pests, and treat if necessary

Grow cacti from seed

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House plants

Amaryllis 'Carmen'

Garden maintenance

  • Top up bird baths with fresh water every day during frosty weather
  • Bring all watering equipment indoors, including hoses and sprinklers, so they don't freeze and split
  • Scoop fallen leaves and debris from ponds, leave on the side so pond life can escape, then add to the compost bin
  • Stand your Christmas tree in a bucket of water in a sheltered spot outdoors until it's time to bring it indoors
  • Clear out your shed, and organise and clean your tools
  • Check tree ties and stakes are firm enough to stand up to winter storms
  • Prune blackcurrants once dormant, removing about a quarter of the old stems
  • Order well-rotted manure or mushroom compost to dig in over winter or spread over bare soil as mulch for worms to take down
  • Order summer-flowering bulbs such as lilies and gladioli

Order your bulbs for next summer

Offers

Gardening offers
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Save over 50% on Lilium regale 'Album'

Lilium regale ‘Album’ delivers large, pure white, trumpet shaped blooms with a soft butter yellow throat and an irresistible fragrance. Reaching around 90cm tall and producing up to fifteen trumpets per stem, it’s a florist favourite and a stunning choice for borders or patio pots.
£12.73£29.96
Supplied as 12 x 16-18cm Bulbs
use code: PLNTSVE
Travel and events
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Save on a luxury stay in the New Forest

Choose your stay from Bartley Lodge, Beaulieu Hotel, Burley Manor or Forest Lodge. Wherever you decide to stay, you’ll discover a welcoming hideaway to rest, recharge and reconnect with nature.
From£159
per couple, per night, for bed and breakfast and a delicious dinner. You will also receive two tickets for the award-winning Exbury Gardens. Based on two adults sharing a double/twin Classic Room. Valid until 30 June 2026, subject to availability. £25 per adult credit towards dinner.
use code: World26
Subscriber discounts
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Nandina domestica 'Firepower'.

Known as heavenly bamboo, Nandina domestica ‘Fire Power’ is tough as old boots, yet immensely pretty. Clumps of bamboo-like canes hold year-round foliage, changing colour from red-flushed young leaves, through red and green in summer to orange and red in autumn and winter.
£14.99-£19.98
Supplied as 2L pots.