Groundcover Junipers Junipers are slow growing evergreens that range in height from 3 in. to 24 in. tall. They are tolerant of heat, drought, cold, poor soils and wind. They are subject to pest problems (spider mites, aphids, borers ) during hot dry summers. Best planted in full sun to light shade, in well-drained soil that receives watering once-a-week. (Plant 6 ft. on center).