Wednesday, May 20, 2015

The New York Botanical Garden: 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 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 to 2 1/2" height
- Leave grass clippings on lawn to improve availability of nitrogen
- Water lawns if there is less than 1" 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, 2 1/2tbs. summer-weight horticultural oil, mixed with 1 gallon of water.


- 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


- 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

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