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June

Flowers & Ornamental Grasses

Flowers & Ornamental Grasses

  • Mulch perennials. Spread a 1 to 2” layer of shredded leaves, evergreen needles or other organic mulch over the soil surface around perennials.
  • Inspect the upper and lower leaf surfaces and stems of plants for aphids, mites and plant bugs.
  • Remove and discard any spotted, blotchy, and discolored leaves as soon as they are discovered. Disinfect tools to reduce the risk of spreading disease.
  • Remove faded flowers (deadhead) on annuals and perennials for a neater appearance and in some cases encourage more blooms.   
  • Pinch back late summer and fall blooming perennials to control height or delay bloom.
  • Keep mums and asters 6 inches tall through the end of the month to encourage shorter more compact growth.
  • Cut back common bleeding heart (Dicentra spectabilis) after last flush of flowers, but before the leaves start to yellow to encourage.  This encourages fresh new growth so you will have green foliage for the remainder of the season.
  • Dig and divide overgrown Siberian iris (Iris siberica) when they finish blooming.  Poor flowering, dead centers, and floppy growth indicate its time to dig and divide. 

Fruits, Vegetables & Herbs

Fruits, Vegetables & Herbs

  • Continue planting warm weather vegetables such as tomatoes, peppers, cucumbers, squash and melons that thrive in warmer soil and air temperatures of early July. 
  • Those in the far south can keep adding heat-tolerant vegetables like southern peas, okra and sweet potatoes. 
  • Harvest early plantings regularly and at the peak of maturity for maximum flavor, nutrition and productivity.
  • Allow the leaves (green fluffy growth) of asparagus to develop on the plants when you are finished harvesting.
  • Place sticky traps in apples, pears and other fruit trees to monitor pest problems.
  • As tomato plants mature, remove the lowest four inches of foliage and mulch the soil to reduce the risk of soil born disease infecting the plant.
  • Harvest radishes when the roots are full size and soil is slightly moist for easy pulling.
  • Thin onion plants when the leaves are 6 inches tall. Use these green onions for eating fresh, using in salads, omelets and other dishes.
  • Watch for squash vine borer. This orange and black day-flying moth lays its eggs at the base of vine crops. The larvae feed inside the stem creating holes and leaving a sawdust-like material at the base of the plant.

Groundcovers & Vines

Groundcover & Vines

  • Remove and destroy spotted leaves on lily-of-the-valley and pachysandra as they appear.  Both plants are susceptible to leaf and stem spot diseases that can usually be controlled with proper sanitation.
  • Check wintercreeper groundcover and other euonymus plantings for scale. Treat infested plants with insecticidal soap or a light weight horticulture oil when the Japanese tree lilacs are in bloom. 
  • Prune out dead branches of spreading junipers, Disinfect the tools between cuts in case twig death is due to phomopsis blight.

Indoor & Holiday Plants

Indoor & Holiday Plants

Lawns

Lawns

  • Apply a low nitrogen slow release fertilizer in early June if you missed the Memorial Day application.
  • Low nitrogen slow release fertilizers will prevent burn when the weather turns hots and dry.
  • Mow high and often enough so you remove no more than 1/3 of the leaf at a time.
  • Leave short clippings on the lawn to add moisture, nutrients and organic matter to the soil. Use a mulching mower or make a second pass to reduce the size of long clippings.
  • Sharpen mower blades to keep your grass looking good, healthy and more drought-tolerant.  You’ll use less fuel and need less time to mow the lawn.

Trees, Shrubs & Roses

Trees, Shrubs & Roses

  • Continue to purchase and plant healthy well-shaped container and ball-and-burlapped plants. Southern gardeners may want to wait for the cooler temperatures of fall to resume planting. 
  • As the temperatures warm, newly planted trees and shrubs need more attention. Water thoroughly moistening the top 12 inches and whenever the top 3 to 4 inches are crumbly and moist.
  • Deadhead repeat blooming and hybrid tea roses for a neater appearance and increase bloom.
  • Watch for Japanese beetles. Do not use traps and look for eco-friendly control options whenever possible.

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