What to do during April in your garden and greenhouse.
Your monthly gardening checklists
Flowers
- Sow hardy annuals, such as love-in-a-mist and pot marigolds, as well as native wildflowers, into gaps in borders
- Enjoy instant colour by planting primulas and polyanthus in pots and at the front of borders
- Protect the new shoots of hostas, delphiniums, lupins and other vulnerable plants from slugs and snails
- Continue deadheading spring bulbs and bedding, so they don't waste energy setting seed
- Plant pineapple lily (eucomis) bulbs in pots for exotic-looking summer flowers
- Sow sweet peas at the base of supports, and transplant those sown in autumn into their final positions
- Spray the new leaves of disease-prone roses with fungicide to control mildew, rust and black spot
- Take basal cuttings from clumps of perennials, such as delphiniums, campanulas and lupins
- Prune hydrangeas, cutting back the old stems to a healthy shoot lower down
- Reinvigorate mature clumps of hardy perennials, such as hostas, asters and daylilies, by dividing and replanting
- Sow sunflowers in a sunny, open site, then water regularly and protect seedlings from slugs and snails
- Check for aphids on roses and rub them off before they develop into major infestations
- Add aquatic plants, such as waterlilies and irises, to garden ponds
Fruit and veg
- Plant second-early and maincrop potatoes
- Place cardboard collars around the stems of brassicas to deter cabbage root fly from laying their eggs
- Pinch out the tips of broad beans if they're covered in aphids, or spray shoots with soap-based solution
- Sow outdoor varieties of tomatoes, chillies and courgettes in pots, so they're ready to plant out in late May or June
- Divide clumps of hardy herbs, such as lemon balm and chives, then replant in pots, borders or a dedicated herb bed
- Sow small batches of rocket and other easy salad leaves
- Continue planting bare-root asparagus crowns and Jerusalem artichoke tubers
- Sow flowering companions in the veg plot, such as pot marigolds and borage
- Continue planting batches of garlic, shallots and onions every few weeks to extend the cropping period
- Sow herbs such as parsley, coriander, dill and chamomile in a sunny bed or container
- Protect emerging seedlings from slugs and snails and find out how to deter them
- Sow fast-growing crops, such as radishes, to make the most of any temporary gaps
Greenhouse
- Prick out seedlings growing in pots and trays as soon as they produce their first true leaves
- Sow sweet peas in deep pots and keep them frost-free in a greenhouse or on a sunny windowsill
- Sow quick-growing microgreens, such as kale and mustard, for nutrient-rich pickings in just a few weeks
- Transplant greenhouse tomatoes into growing bags or large containers and tie in the stems to supports
- Plant up hanging baskets and pots with summer bedding, but keep indoors until after the last frost
- Sow herbs in pots or trays, including basil, chives, parsley, fennel and coriander
- Thin out heavy fruit sets on peaches and nectarines, leaving fruits about 10cm apart
- Sow runner beans, French beans, cucumbers, courgettes, pumpkins and sweetcorn in pots
- Pinch out the shoot tips of fuchsias to develop bushier plants
- Attach guttering to the greenhouse and install a water butt, so you can make good use of April showers. Listen to this podcast episode to find out more about water wise gardening.
- Clean greenhouse glazing to let in as much light as possible
- Maintain good plant hygiene, picking off faded blooms and dead leaves before fungal diseases can take hold
- Open greenhouse doors and vents on warm days, or install automatic vent openers, to improve air circulation
House plants
- Start feeding houseplants once a week with liquid fertiliser, continuing through to autumn
- Water your house plants more regularly as the temperatures warm, check the soil before watering. Take a look at our guide to watering house plants
- Maximise the amount of light your house plants receive by moving to brighter spots, or choose house plants that will grow in shadier spots
- Some house plants, like snake plants, are particularly prone to collecting dust on their leaves. So be sure to give these a wipe regularly
- Try and keep house plants away from temperature fluctuations caused by draughts or central heating
- Check your house plants for pests like aphids, scale insects, thrips and mealybugs
Garden maintenance
- Put a bag of barley straw in ponds to discourage algae and keep the water clear all summer
- Lay turf or sow grass seed to create a new lawn or repair damaged patches
- Cut back tatty old fern fronds to make way for new ones that are starting to unfurl
- Keep cloches or large sheets of fleece handy to protect young plants if late frost is forecast
- Cut away unwanted suckers growing around the base of trees and shrubs
- Hoe between rows of veg seedlings regularly, as weeds grow rapidly at this time of year
- Remove moss and weeds in turf, and boost growth with a nitrogen-rich lawn feed
- Check that guttering on sheds and greenhouses is clear of debris, so that April showers will fill up water butts
- Add new aquatic plants to ponds and divide established plants that have outgrown their baskets
- Put pumps and fountains back into ponds, thoroughly cleaning the filters first
- Treat problem weeds, such as nettles and brambles
- Look out for clusters of aphids on shoot tips and young leaves, and wipe off before they multiply
- Keep putting out food for birds, as they're busy raising their broods
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