How to Make Petunias Bloom
- 1). Incorporate 2 lbs. of 5-10-5 fertilizer or 1 lb. of 10-10-10 dry fertilizer for every 100 square feet of garden area. Make sure the area in which you're planting receives at least five hours of direct sunlight per day.
- 2). Plant the bulbs or new flower growth transplants a foot apart from each other, when the soil is 60 degrees F or higher, and there is no danger of frost. Transplants should go into the soil at the same depth with which they were planted in their former container.
- 3). Wet the soil down to 6 inches below surface level when you water. Make sure the plants have a small and shallow trench around their base to help retain water where the plant can get to it.
- 4). Pinch multifloras and grandifloras back when they get to be 6 inches tall, in order to promote the quick blooming of side shoots on the flower. Ground cover and millifloras should not be pinched back.
- 5). Weed out faded flowers, roots and all, to encourage and prolong blooming by keeping seed maturation from happening.