June in the Garden

by Jane & Wilson Grahame

  • Weeds – easier to pull when the soil is moist.
  • Keep planting out annuals.  Feed regularly with fertilizer and water well.
  • Containers and hanging baskets dry out quickly.
  • Divide German bearded irises after flowering – about every 3 years.
  • Mulch lilies with compost or well-rotted manure.
  • Prune back deciduous shrubs, such as Mock Orange, after flowering.
  • Start taking shrub cuttings.
  • Cut back suckers on lilacs and prune off faded flower heads.
  • Keep newly planted hedges, trees and shrubs well watered.  Even drought tolerant plants must be watered regularly for the first few years.
  • Check for aphids, mildew and black spot on roses.  Pick off and destroy diseased leaves.
  • Mulching over the root zone helps keep the soil damp while suppressing weeds.  Use well-rotted manure compost or other organic material.  Peat moss dries out if used alone and wood chips steal nitrogen from the soil as they rot, so use extra fertilizer.
  • Deadhead.  Cutting off dead flowers helps prevent seed formation and keeps many herbaceous plants flowering longer.
  • Variegated plants may produce branches that revert to their plain green forms.  These grow strong and can take over if not removed.
  • Hedges  – clip.  Do not cut coniferous hedges back too far as most will not regrow once green branch ends are removed.  To keep such a hedge narrow, prune it a little every year.
  • Keep looking for pests – weevils, aphids, caterpillars, etc.
  • Fertilize roses after the June flush of bloom.
  • Just as perennial delphiniums and lupins go to seed cut them right to the ground, thus encouraging clean new growth and a second set of blooms.
    All peony flowers should be cut before they shatter and put in the garbage.  The tissue could be infected with the fungal disease Botrytis.
  • Delphinium.
    May give a second show – deadhead after initial blooming, and cut back stems by two thirds.  It’s a good idea to provide an extra top dressing of compost or manure as compensation for this overtime work.
  • Asters.
    Cut back by one third when plants are about a half metre high.  This will build strong sturdy stems and prevent your plants from falling over when blooming in the fall.


Posted in Gardening Tips