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April Garden Calendar – NC Mountains

Plants in Flower:

  • Crabapple, Carolina Silverbell, Dogwood, Redbud, Flowering Cherry, viburnum, Pearlbush, Lilac, Carolina Rhododendron, Sweet Shrub, Piedmont Azalea, Loropetalum, Exbury Azalea, Spirea, Pieris, Evergreen Azaleas, Kerria (Easter Rose), Drooping Leucothoe, Weigela, Wisteria, Periwinkle, Ajuga, Candytuft,
    Violets, Columbine, Trillium, Flags (Dwarf Iris), Bloodroot, Bleeding Heart, Jack-In-The-Pulpit, Anemone and Siberian Squill.

What to Fertilize

  • Fertilize shrubs if not done in March.
  • Once you can determine whether your fruit trees have any fruit, you can decide how much fertilizer to give them.

What to Plant

  • Many gardeners prefer to transplant azaleas in April so they can group the
    plants according to their flower color.
  • The following vegetables can be planted this month: beets, cabbage, Chinese
    cabbage, Swiss chard, broccoli, cauliflower, onion, and potatoes.

What to Prune

  • Prune spring-flowering plants like azalea, lilac, forsythia, spirea, and
    weigela after the flowers fade.
  • Prune berry producing shrubs like holly and pyracantha while in flower to
    prevent complete removal of all of this season’s berries.
  • If needed, trim spring flowering trees like Bradford pear, flowering cherry and redbud.
  • Cut out any winter damage that may have occurred this year.

Pest Outlook

  • Observe the following landscape shrubs for the following insect pests: azalea-lacebug, boxwood-leaf miner, euonymus-scale, hemlock and juniper-spruce mites and spray as needed.
    Hybrid rhododendron should be sprayed for borers annually.
  • Spray iris beds for iris borers.
  • Treat broccoli, cabbage and cauliflower for worms as needed. An organic product containing BT is recommended.
  • Spray your squash plants at first bloom near the base of the stem to control squash vine borer.
    Continue through June 1 and use only the recommended insecticide.
  • Spray your apple and pear trees with streptomycin for control of fireblight while the trees are in bloom. Apply two times, once at early bloom and a second treatment at full bloom. In wet spring weather consider a third application.
  • Start a fungicide spray program for your bunch grapes this month. Follow
    with weekly sprays.
  • Continue with the rose spray program.
  • Begin weekly tree fruit sprays after flower petals fall.
  • With the exception of borer insects, always scout your landscape plants before spraying. Pests may not be present.

Lawn Care

  • Maintain mowing height of fescue and bluegrass at 3 inches.
  • Do NOT fertilize cool season lawns such as tall fescue or Kentucky bluegrass anymore this spring. April is the first month to fertilize zoysia lawns.


  • This is a good time to layer new plants by lowering a branch of your favorite shrubs and covering it with soil and a stone.

Specific Chores

  • Visit your local garden centers and nurseries to see what plants and products are available.
  • Mulch all of your landscape plants as needed. Pine needles, cypress mulch and pine bark are good mulches. Pine bark, cypress mulch, pine needles and hardwood bark are good mulches.
  • Prepare labels for all new plants and keep records on how well they perform.