April 1-7
Shrubs and trees best planted or transplanted in spring, rather than fall, include butterfly bush, dogwood, rose of Sharon, black gum (Nyssa), vitex, red bud, magnolia, tulip poplar, birch, ginkgo, hawthorn and most oaks.

April 1-14
Start cucumber, cantaloupe, summer squash and watermelon seeds indoors in peat pots.

April 1-14
Prune peaches and nectarines now.

April 1-14
Asparagus and rhubarb harvests begin.

April 15-23
When crabapples are in bloom, hardy annuals may be transplanted outdoors.

April 15-23
Transplant Virginia bluebells (Mertensia virginica) after bloom but before the foliage disappears.

April 24-30
Begin planting lima beans, cucumbers, melons, okra and watermelons.

April 24-30
Easter lilies past blooming can be planted outdoors. Set the bulbs 2-to-3 inches deeper than they grew in the pot. Mulch well if frost occurs.

April 24-30
Prune spring flowering ornamentals after they finish blooming.

Events
April 6            Arbor Day at the Garden (tree giveaway)
April 7 + 8      Meet Me Outdoors events at Missouri Botanical Garden, Butterfly House and Shaw Nature Reserve
April 21 + 22      Chinese Culture Days
April 26 – 28      Herb Days Sale at Missouri Botanical Garden
April 29          Tulip trop 5K at Missouri Botanical Garden
All April      Spring Fling at the Butterfly House
Weekends in April      Polliantor Plant Sales at the Butterfly House