Divide and replant iris.
%y Gardening "To Do" Tips by Month for Columbine, CO
Finish pruning spring-flowering trees and shrubs by the end of the month.
All vegetable crops, including warm-season plants, can go in the ground now.
Mow your lawn when grass is at a height of 2 to 3 inches to best keep weeds down.
Continue to sow carrots, beets, and beans to spread out the harvest.
Start seedlings of broccoli, cauliflower, and cabbage now so they can be transplanted in the fall.
Pull out any bolted lettuce, spinach, or radish plants.
Thin overloaded fruit trees; thinning them will allow for larger and healthier fruit to grow.
Harvest early season fruits and vegetables.
Protect fruit trees from animals and pests.
Pull soil up against potato plants when they are 9 to 12 inches tall.
Sidedress asparagus and rhubarb with aged manure or fertilizer (10-10-10 formulation).
Protect ripening strawberries from birds.
Eliminate weeds when they are small and easy to pull. By keeping your plants well-watered and -fertilized, they will quickly fill in spaces instead of weeds.
Thin your seedlings to their proper spacing so as to avoid overcrowding. Remove dead flowers from plants to encourage new growth.
Remember to water your plants. It is better to water your garden thoroughly once a week to ensure that a deep root system is established.
Deadhead fading blossoms from perennials and roses.
Prune older canes from climbing roses.
Fertilize roses after the flowers start to fade.
Give perennials a fertilizer boost (5-10-10 formula).