Ph should be 5-6, add sulfur to maintain, keep mulched, 1" water each week, feed often to maintain PH, trim SPRING only to shape, dead head dead flowers use insecticidial soap for bugs, cover in heavy winds and hard freeze. You are lucky to have these beautiful plants outside. In NE PA there are inside plants and out only for the summer months and back inside on nights in the low 40's............good luck with this beautiful plant.