Monitor Your Garden’s Health with a July Checklist

To promote a second, late-summer flower show, cut back, shear or remove flower spikes from the following early blooming perennials: catmint, geraniums, salvia and delphiniums.

Annuals in containers and hanging baskets may require daily watering during hot or windy weather. Continue to fertilize container plants with half-strength balanced liquid, but avoid applying in the heat of the day or during long, hot dry spells. Always water plants before fertilizing.

Remove spent flowers or seed heads of daylilies immediately to conserve plant energy.

Monitor foliage of densely planted annuals and perennials that might show fungal attacks due to cool, damp weather earlier this season.

Continue to pinch out new growth of tall sedums, asters and chrysanthemums until the middle of the month.
 Stake tall plants, if necessary, by tying them with soft nylon ties.

Continue to guide clematis vines and all other soft-stemmed vines to their supports.

Make note of empty spots in borders that might benefit from planting summer-flowering bulbs next year.

Seeds of perennials can be sown directly into the garden at this time. Note their location to avoid accidental “weeding” next spring.

Keep a garden journal—note what’s working and what isn’t for next year’s garden. Take weekly photos of your garden on your phone for documentation.

Pose questions or problems with the University of Minnesota Extension at or drop by the Arboretum on weekends to talk with Master Gardeners.