Answer: Your new garden sounds lovely! Gardenias do appreciate a soil pH between 5.0 to 6.0, and as much organic matter as your sandy soil can hold. Use a fertilizer labeled for acid-loving plants after the plant has bloomed. If you haven't already applied mulch, use an acidic mulch, such as cottonseed hulls. If you amended your soil with compost prior to planting, your hawthorn won't need feeding until next spring before they put out new growth. Your begonias will appreciate a slow-release fertilizer applied as directed on the product label. Spider grass is a common name used for Liriope or Ophiopogon, but as long as you fortified your soil with compost or other organic amendments, this plant will be fine without added fertilization. Just keep adding organic matter to the soil to keep humus content high and it will be happy.
I hope this helps!
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