Because of the constant flush of water through the soil in hanging baskets, even high-quality potting soil will lose nutrients over time. This will leave the flowers devoid of nutrition and unable to flourish. Deliver fertilizer to hanging baskets often during the growing season to keep the plants healthy.
Water the hanging baskets thoroughly immediately before you fertilize to ensure that the potting soil is saturated. If you fertilize the plants when the potting soil is dry, you risk burning the sensitive roots of the plants. Allow the water to drain from the bottom of the baskets before you proceed.
Mix the fertilizer with water in the watering can, according to the recommendations on the label for the size of your hanging basket.
Pour the fertilizer over the soil in the basket. Do not allow the fertilizer to splash onto the plant foliage as you pour. If fertilizer does splash onto the foliage, wash it off immediately with plain water.
Fertilize hanging baskets every other week with the water-soluble fertilizer throughout the growing season.