June Gardening Calendar

At last, summer has arrived - it's time to plant out colourful summer bedding plants, enjoy beautiful and fragrant roses coming into bloom, and pick home grown salad leaves and herbs.

Flowers and shrubs

  • Cut back the dead and dying foliage of daffodils, tulips, flag irises, oriental poppies and spring bulbs to clear flower beds for summer planting
  • Deadhead camellias and rhododendrons after flowering and feed with a special liquid Fertiliser containing iron, such as sequestrene
  • Lightly trim lilac, philadelphus, broom and genista after flowering,along with box topiary, formal edging and privet hedging to keep plants neatly in shape
  • If you haven't done this already, lift and divide clumps of hardy primulas
  • Tidy up rock gardens, dead heading faded blooms, digging out weeds and replenishing grit
  • Train clematis, honeysuckle and rose shoots to their supports and stake any other tall and floppy plants, such as lilies and delphiniums
  • Spray roses to protect them from pests and diseases; use secateurs to remove suckers growing from the stems of standard roses
  • Plant out tender summer-bedding plants, such as begonias and dahlias, once all risk of frost has passed; keep a few bedding plants in reserve to plug gaps where disasters strike
  • Sow seeds for wallflowers, sweet Williams, Canterbury bells and forget-me-nots
  • Take cuttings of non-flowering new shoots from shrubs and pinks (Dianthus) and pot them up in gritty compost
  • Propagate wisteria, clematis, honeysuckle and ornamental vines by layering their shoots into the soil
  • Hoe borders on hot sunny days to remove developing weed seedlings before they start taking over!
  • Keep hanging baskets and patio pots watered and give them a weekly liquid feed, but be careful about your water usage and use grey or rain water where possible

Fruit and vegetables

  • Sow seeds of herbs, such as coriander, parsley and basil
  • Sow summer salads in guttering to grow quick crops
  • Plant out leeks and brassicas in a raised seed bed for good drainage
  • Water onions and beans to keep them growing strongly along with other crops, such as gooseberries and strawberries, to encourage fruits to swell
  • Plant cold-stored strawberry runners from mail-order fruit specialists for crops in just 60 days
  • Cover strawberries and other ripening fruit bushes with netting to keep birds off the fruitd
  • You can also try hanging old CDs among crops and fruit trees to scare birds away
  • Thin out congested fruits on apples and plums, and remove the smallest fruits from heavy gooseberry crops and use for cooking - the remaining fruits will grow far larger if competition is reduced
  • Spread mulch around beans and other crops to help conserve soil moisture
  • Stop cutting asparagus by the end of June to allow the ferns to form
  • Feed all crops with a liquid Fertiliser, especially tomatoes and crops in grow bags, and use soapy sprays at the first signs of greenfly and blackfly
  • Harvest early potatoes, carrots and salad crops
  • Sow seeds of the following vegetables outside: beans, beetroot, carrots, courgettes, chicory, dwarf French beans, French beans, kohl rabi, lettuces, marrows, mini-cauliflowers, mizuna, pakchoi, radishes, runner beans, rocket, spinach, swedes, sweetcorn, tomatoes and turnips

In the greenhouse

  • Open your greenhouse doors and vents daily, and damp down the floor every morning; increase shading and ventilation to keep temperatures down on hot days
  • Set up a 'watering bench' using capillary matting to look after pot plants and add a liquid feed to them once a week
  • Take cuttings from non-flowering shoots of hydrangeas, fuchsias, pelargoniums, osteospermums, marguerites, coleus and verbena
  • Pinch out developing sideshoots on tomato stems, water them regularly to prevent fruits splitting and tie greenhouse tomatoes to their supports as they grow taller
  • Thin out heavy crops of peaches and nectarines, leaving remaining fruits about 10cm apart
  • Isolate new purchases from other plants until you are sure they are pest-free; be on the look out for and introduce biological controls if you have discovered pests, such as whitefly and red spider mite. Hang yellow sticky traps in the greenhouse to help control whitefly
  • Repot houseplants that have become pot bound
  • Feed plants with full-strength Fertiliser solution once a week, or apply a more diluted feed every few days

Lawn and trees

  • Mow your lawn each week and spend a little time on the edges to make it look its best
  • Feed lawns with a liquid or granular lawn Fertiliser, treating lawn weeds and moss if necessary
  • Gradually lower the cutting height of your mower as grass growth increases
  • Add grass cuttings to the compost heap, or use them as mulch around fruit trees
  • Run a seeping hose (a hose with small holes along it) through dry shaded borders or along the base of hedges so they can be watered weekly in dry weather
  • Water newly planted trees if conditions turn hot and dry

General maintenance

  • Empty, mix and refill compost bins to aerate the matter and improve the composting process
  • Top up water levels in ponds and remove floating water weeds with a net - don't forget to clean out the filters of pond pumps to get rid of any debris too
  • Clean paths and paving with a pressure washer, then water with a solution to deter moss and algae

Little green fingers

  • This month, children can get involved with watering the tomatoes each day and see how they swell and become red as they ripen. Kids will enjoy choosing the best fruits to take in their school lunch box or deciding which ones go into the salad for family meals.