HOME (Indoor plants and activities)
Start seeds of warm-season plants, including tomatoes, peppers, eggplant, marigolds, zinnias and petunias, indoors for transplanting later to the garden.
Harden off transplants started earlier in spring before planting outdoors -- gradually expose the young plants to outdoor conditions of wind, brighter sunlight and lower moisture.
Apply fertilizer to houseplants according to label directions as days grow brighter and longer and new growth begins. Foliage plants require relatively high nitrogen fertilizer, while blooming plants thrive on formulations that are higher in phosphorus.
Keep Easter lily in a bright, cool location, out of direct sunlight. Water as soil begins to dry. The yellow pollen-bearing anthers inside the flower can be removed by pinching to prevent staining of the petals.
YARD (Lawns, woody ornamentals and fruits)
Plant a tree in celebration of National Arbor Day, April 30. Bare-root stock should be planted before new top growth begins. Balled- and-burlapped and containerized stock can still be planted later in spring.
Fertilize woody plants before new growth begins. Two pounds of actual nitrogen per 1,000 square feet should be sufficient.
Complete pruning chores, removing dead and injured branches first.
Apply a prebloom, multipurpose orchard spray to fruit trees.
Remove winter coverings from roses, but keep mulch nearby for protection from late freezes. Prune and fertilize as needed.
Apply pre-emergent herbicide to control crabgrass in lawns. Approximate dates of application are April 1 to April 20 in southern Indiana and April 21 to May 10 in northern Indiana.
GARDEN (Flowers, vegetables and small fruits)
Plant seeds of cool-season crops directly in the garden, as soon as soil dries enough to be worked. When squeezed, soil should crumble instead of forming a ball. Cool-season crops that can be direct-seeded include peas, lettuce, spinach, carrots, beets, turnips, parsnips and Swiss chard.
Plant transplants of cool-season crops, such as broccoli, cauliflower, cabbage, Brussels sprouts, kohlrabi and onions.
Plant or transplant asparagus and rhubarb crowns. For best plant establishment, do not harvest until the third year after planting.
Plant sections of certified, disease-free potato "seed" tubers.
Allow foliage of spring-flowering bulbs to remain in place after blooms fade. Leaves manufacture the food reserves, which are then stored in the bulb for a repeat showing next year.
Plant hardy perennials, such as daylilies and delphiniums.
Start tuberous begonias and caladiums indoors for transplanting to garden later.
Remove winter mulch from strawberries, but keep mulch handy in case late frosts are predicted and to help keep weeds under control.
Plant or transplant strawberries, raspberries and other small fruit.
Prune grape vines to remove dead or weakened limbs, and repair support trellises as needed.
GARDEN SHOW CALENDAR
March 19-20 -- Morgan County Master Gardeners' GardenFest and Pansy Sale, National Guard Armory, Martinsville, http://www.mcmastergardeners.org/
March 26-27 -- Montgomery County Lawn & Garden Show, 4-H Building, Crawfordsville,
April 9-11 -- Indiana Gourd Society State Show, St. Joseph County Fairgrounds, South Bend, http://www.indianagourdsociety.org/
April 10 -- Boone County Gardenfest, Boone County Fairgrounds, Lebanon, http://www.bccn.boone.in.us/mg/
April 10 -- Hendricks County "Gardening for All Ages," Hendricks County Fairgrounds and Expo Center, http://www.hendricksgardeners.com
April 17-18 -- Purdue SpringFest (including Student Hort Show and Bug Bowl), Purdue West Lafayette Campus, http://www.extension.purdue.edu/sfest/
April 17-25 -- Cincinnati Flower Show, Symmes Township Park, Symmes Township, Ohio, (572) 872-9555 or http://www.cincyflowershow.com/
April 24 -- Garden Expo, Purdue Master Gardeners, Tippecanoe County Fairgrounds, Lafayette, http://www.tippecanoemastergardener.org/news.html
April 30, May 1-2 -- Orchard in Bloom Garden Show, Holliday Park, Indianapolis, (317) 713-5720 or http://www.orchardinbloom.org/