When growing potted plants, the limited space in the pot makes it difficult for the plants to absorb sufficient nutrients from the soil. Therefore, to ensure lush growth and more abundant flowering, foliar fertilization is often necessary. Generally, it is not advisable to fertilize plants while they are flowering. So, can potted plants be sprayed with foliar fertilizer during blooming? Let’s take a closer look!

1. No

Potted plants should not be fertilized while flowering—neither through soil fertilization nor foliar spraying. Fertilizing during the flowering period can easily lead to bud and flower drop. This happens because, after fertilization, the plant directs nutrients toward growing side shoots, causing the buds to lack nourishment and fall off. Additionally, newly bloomed flowers may wither quickly after fertilization.

2. Fertilize Before Flowering

To encourage more blooms in potted plants, fertilization is best done before flowering. Applying an appropriate amount of phosphorus-potassium fertilizer at this stage helps promote bud formation, extends the flowering period, and enhances ornamental value. Note that pure nitrogen fertilizer should be avoided before flowering, as it can cause excessive vegetative growth with more leaves but fewer flower buds.

3. Common Foliar Fertilizers

Common foliar fertilizers for potted plants include potassium dihydrogen phosphate, urea, and ferrous sulfate. Additionally, ammonium nitrate, ferrous sulfate, and sodium dihydrogen phosphate can also be applied to the leaves. These fertilizers promote plant growth, keeping the foliage lush and glossy, thereby improving their aesthetic appeal.

4. Fertilization Method

The concentration of the fertilizer must be carefully controlled, as overly concentrated solutions can scorch the leaves. Generally, foliar fertilizers should have a concentration between 0.1% and 0.3%, following the principle of “little and often.” Prepare the diluted fertilizer solution and pour it into a spray bottle, then evenly mist it onto the plant’s leaves, ensuring the undersides are also adequately covered.