![]() Potassium can be an interesting with problem clematis. These promote foliage growth, and you do not want a foliage-heavy plant with few blooms. The cardinal rule for clematis is to avoid high-nitrogen fertilizers. Clematis ‘Lady Kyoko’ is a new variety that won a 2020 Green Thumb Award. For example, the numbers on a bag or package with a high phosphorus content might be 10-20-10. The amount of phosphorus should be higher than the nitrogen or the potassium. Way before the “blossom booster” fertilizer formulas were popular, I learned from Ton that the best way to impact a plant’s flowering is with phosphorus. Ton is a retired clematis expert who now devotes his time to clematis breeding and collecting.
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