UC Master Gardeners of Merced County
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Garden To-Dos: May 2026

By Pat Shay, UC Master Gardener of Merced County

It’s the time of the year we’ve all been waiting for, right!? Warmer temps, so we can start planting. Loads of marked up catalogs and seed packets ready for use. A couple of bags of fresh potting soil to start the seeds and pot up starts either from our own cuttings or from SALES! Oh boy, don’t we wish this season was twice as long as it is to get as much done as we’ve been planning! Our rain has been feast or famine when we just want a full aquifer.

Begin to apply mulch in preparation for warmer weather ahead….and to limit growth of weeds, being careful not to get the mulch right up to the base of the plant (leave three or four inches of bare ground around the base). Dead head roses to keep blooms coming. Using sharp clippers, make a 45 degree cut just above a five leaf, outward growing sprout.
To deal with garden pests, use a good blast of water from your hose to knock aphids off. Lady beetles should already be appearing. If you need more than naturally live in your garden, you can purchase a package of them at a garden/home supply store. Refrigerate the package overnight, then release in your garden early in the morning, making sure that there is either a good amount of dew or that you sprinkle a bit before releasing them. Add grass clippings to compost pile, remembering to keep brown and green ‘additions’ in balance. Turn frequently.
A good time to plant dahlias. Do NOT overwater. Dahlias do best in ground that drains quickly. Plant summer crop seeds (beans, cantaloupe, corn, cucumbers, etc.) – or starts (egg plants, peppers, tomatoes). Create basins around plants to hold water. Make sure well-drained before adding more water. In a hot spell….do not allow to wilt.