What brand is a good high phosphorus, water soluble fertilizer for my Mandevilla plant?
What Brand of High Phosphorus Fertilizer Is Water Soluble
Certified GKH Gardening Expert
I would recommend that you look for 'bloom booster' fertilizers. These fertilizers are higher in phosphorus (middle NPK number), which will help the plants have more blossoms. Miracle-Gro Bloom Booster is a popular one. Follow the directions on the product you purchased, as they each have different recommendations.