Perennials: Weed, weed, weed. It is important to eliminate pests like wild mustard before they go to flower and spread their seeds. Cut back clematis vines. Make sure their roots are shaded and give them a trellis or something to climb. Looking for your columbine? It may have perished but spread its seeds elsewhere in the garden. Aquilegias are short lived but prolific.
Flowers: If the weather is mild, hardy annuals seedlings may be moved to a cold frame to harden off. Make sure to close the cover on cold nights and then reopen it on warm days.
Vegetables: Continue planting onions, carrots, beets, broccoli, and lettuce in the garden. Plant potatoes as soon as the soil is warmed and somewhat dried out. Give new seedlings plenty of light. Fertilize with a weak solution. Set out strawberry plants and mulch. Fertilize and lime fruit trees. Finish pruning before the buds break.
Trees and shrubs: Prune late blooming hydrangeas. Blue and pink hydrangea are dependent on the pH of the soil. Alkaline soil produces pink flowers; acidic soil produces blue flowers. White hydrangeas are not affected by soil pH. The new ‘Endless Summer’ hydrangea blooms on new and old wood, but it is still a good idea to prune it lightly in the spring.
Lawns: Continue cleanup and seeding. The best way to get rid of dandelions is hand digging — a few at a time. It’s good exercise.
Houseplants: Repot oversize plants. Discard any that have become tired or will not survive the summer.
General: Biodynamic sowing is a complex system which takes into consideration the position of the moon, sun and constellations.