There are natural products that you can apply for controlling grubs of June beetles, including insect-devouring — but plant-friendly — nematodes.
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Rose of Sharon is a hardy and fun deciduous shrub for our climate. It’s considered mesic in its water use and not meant for desert landscapes.
Desert climates are notoriously low in humidity, particularly as the day gets warmer, so we enjoy fewer plant diseases and worry about them less than in places with humidity.