University of Maryland Extension

June Ornamental Plant Tips

blooming asters

Photo: Aster is a large genus of perennial flowers which includes our Maryland native, New England aster (novae angliae). It is one of many flowering plants that will attract beneficial insects to your landscape.

 (More tips from HGIC)

  • Attract beneficial insects to your landscape by planting a wide variety of flowering annuals and perennials that will bloom over the entire growing season. Good choices are plants in the following families: daisy (marigolds, daises, asters, mums), carrot (dill, fennel, anise, yarrow, parsley) and mint (all mints and thymes).
  • Pinch out the flower buds of fall blooming asters, mums, goldenrod and other fall bloomers to keep plants bushy and prevent early flowering.
  • Cut Iris flower stalks down to the crown when they are finished blooming. Leave the foliage alone. If your iris are over-crowded, June, after flowering, is the recommended time to lift and divide them
  • Iris borer larvae tunnel down and feed on the rhizomes. The leaves and flower stalks may wilt. The best control is prevention. To prevent borer attack do not mulch your irises, plant rhizomes high in the planting bed and select full sun sites. If you suspect borers, dig up the rhizomes after bloom, cut off rotted and infested portions and re-plant.
  • Thrips feed on flower buds and opened flowers causing them to turn brown. They cause leaf undersides to appear dirty and silvery. They are slender, minute and appear yellow-brown in color and transparent. Thrips are especially bad on gladiolus and will prevent flowers from opening.
  • Brown, bulls-eye lesions on pachysandra are an indication of the fungal disease volutella. Thin out plants to improve circulation.
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