Prune off any growth that may have been damaged by late frosts.
Pinch back late summer/fall flowering perennials if you want to promote more branching & blooms.
Deadhead spring flowering perennials and bulbs.
Continue planting additions to the perennial border.
Keep new plantings well watered.
Keep deadheading. This will extend the bloom period for many perennials and also control aggressive reseeding.
Stake those perennials that you know are going to get leggy later in the season.
Start watching for Japanese Beetles. There are many ways to deal with these destructive pests. Picking them off by hand or knocking them into a bucket of soapy water can be time consuming, but effective. There are also many spray insecticides that work well. Come in and ask about our recommendations. Understand that once the plants have sustained damage, that damage does not heal. You will see it until the leaves fall off.
Check annual containers and hanging baskets daily for watering.
If you go on vacation, have someone water containers and new plantings while you are gone.
Long blooming perennials like Nepeta and Coreopsis can benefit from a shearing now. You can cut them back by as much as ½. Late in the month some perennial geraniums can benefit from the same treatment.
Cut flowers for fresh arrangements and enjoy.
Keep watering. New plantings still need moisture, with deeper, less frequent watering. Established plantings may benefit from watering at this point.
Most annual containers and hanging baskets need watering at least once a day at this point—sometimes more. They may also benefit from some additional fertilizer.
Pinching of fall bloomers should stop in mid to late July. Some staking may be needed.
Prune crowded or sprawling perennials to keep them in their place.
If you go on vacation, be sure to have someone water containers and new plantings while you are gone.