Why Gardenia Only Grows Buds but Never Blooms, and How to Fix It
1. Specific Causes
When this happens, do not jump to the conclusion that something is wrong with your care. First, check whether it is within the blooming period, that is, June to August. However, due to geography and various other factors, early bloomers may flower in late May, while late ones may bloom in July. If it is not in season yet or has just entered the blooming period, then simply keep up good care and it will bloom naturally in time. If the blooming period has arrived, or it is already at the end of the season, and the buds still have not opened, then there is a problem, and you need to do the following five things.
2. Solutions
(1) Apply phosphorus and potassium fertilizer: Starting in April, you should stop using nitrogen fertilizer and use phosphorus and potassium fertilizer instead. Once every half month is enough, applied three times in a row. Liquid fertilizer is best. Do not make the concentration too high.
(2) Adjust the light: Light that is too strong or too weak is not good for blooming. Therefore, provide plenty of scattered light as usual. After entering May, if the light is too strong, be sure to shade the plant.
(3) Control watering appropriately: If there is too much water, the plant will also struggle to bloom. Around the blooming period, watering should be appropriately reduced.
(4) Adjust the soil: The plant blooms easily only in acidic soil. If the soil is alkaline, find a way to adjust it, for example by using some ferrous sulfate.
(5) Prune appropriately: Improper pruning, or going a long time without pruning, also makes it hard for buds to open. Cut off some of the messy and diseased branches, which will help encourage blooming.