June Gardening Tips


Chores and Maintenance:

  • Continue to cultivate planting beds to remove weeds
  • Continue to dig and divide early-blooming perennials after flowering
  • Water, water, water as necessary
  • Continue to mulch planting beds
  • Set supports for floppy plants, vines and vegetables
  • Deadhead rhododendrons, lilacs and perennials after flowering
  • Add to, aerate and moisten compost pile to speed decomposition
  • Continue to check for pests and other problems and treat as necessary
  • Mow lawns regularly to keep grass at 2-2½ in. height
  • Leave grass clippings on lawn to improve availability of nitrogen
  • Water lawns if there is less than 1 in. of rain per week
  • Harvest cool-weather lettuce, radishes and scallions
  • Begin to spray roses every week with baking soda solution* to protect against black spot disease
  • Continue application of deer repellents
* Cornell University formula consists of : 3 tsp. baking soda, 2½ tbs. summer-weight horticultural oil, mixed with 1 gallon of water.

Planting:

  • Complete moving self-sown annuals and perennials to desired location
  • Sow seeds of fast-growing annuals like marigolds, zinnias, and cosmos directly in the garden
  • Sow seeds of heat-tolerant vegetables
  • Continue to plant and transplant perennials, weather and soil conditions permitting
  • Finish planting summer annuals
  • Complete planting summer-flowering bulbs such as cannas, gladiolas and dahlias
  • Plant caladium and tuberous begonias in shady spots

Pruning/Fertilizing:

  • Continue to prune all plant material to remove any diseased, dead, weak or crossing branches
  • Complete pruning early spring-flowering shrubs
  • Prune evergreens and evergreen hedges into early summer
  • Continue deadheading roses
  • Fertilize roses after peak bloom
  • Complete fertilizing spring-flowering bulbs
  • Fertilize annuals and container plants
  • Fertilize vegetables

* These gardening tips are applicable for the southeastern New York region - USDA Plant Hardiness Zones 6a and 6b which include New York City, northern New Jersey, Rockland county, Westchester county, southern Connecticut and parts of Long Island. Plant hardiness zones refer to geographic areas where the growing season of plants is determined by the time of killing frosts in the spring and fall. If you live in a more southerly plant hardiness zone, you can start gardening earlier in the season or in more northerly zones, you can start later. Even within zones, climatic factors such as altitude, proximity to water, wind exposure, winter sun exposure and snow cover contribute to the existence of different "microclimates" and can influence plant adaptability.

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