What Is the Best Fertilizer for Gardenia? A Complete Guide to Fertilizing Techniques
People all say that if a child is to grow well, they must eat plenty of food so their body stays healthy and their resistance grows strong, and anything in nature also needs sufficient nutrients. Just like the gardenia, it needs enough fertilizer to grow lush, but you cannot just fertilize it however you like and expect results. This takes technique. Let's take a look below.
Gardenia Fertilizing Techniques
1. Apply slow-release fertilizer: One "lazy gardener" fertilizer method is slow-release fertilizer. Apply the fertilizer in the pot, and the nutrients in it are released slowly, so there is no need to worry that over-fertilizing will damage the plant. However, stop fertilizing after October and during the flowering period.
2. Topdressing: From April to October, apply topdressing once a month except during the flowering period. Starting in April, spray potassium dihydrogen phosphate once a week until flower buds appear on most branches of the whole gardenia.
After buds appear, water the roots twice with potassium dihydrogen phosphate, which can enhance the plant's stress resistance and promote larger, more fragrant flowers. But as soon as the buds crack and show white, stop fertilizing.
3. Fertilizing after repotting: If you have repotted the plant, place it in a shady spot to recover from repotting, and fertilize only after the recovery period has passed.
4. Apply enough base fertilizer: During care, if the gardenia grows slowly, has weak branches, and needs frequent topdressing, it means the base fertilizer was insufficient at planting time. Before planting the gardenia, add organic fertilizer (decomposed animal manure, cake fertilizer) to the soil and mix it evenly with the soil.
What Fertilizer to Use for Gardenia
Gardenias are afraid of strong fertilizer. Before buds appear, apply cake fertilizer water rich in phosphorus and potassium twice as topdressing. After buds appear, stop fertilizing. During the growing period, you can use decomposed cake fertilizer or manure water, adding a small amount of ferrous sulfate, also called black alum, as topdressing, applied once a month.
1. Fertilizing periods: Foliar fertilizing of flowering plants and bonsai is generally sprayed before flowering, during flowering, during fruit swelling, before overwintering, and during nutrient deficiency periods. The interval between each spray is 7 days to 10 days, with 2 to 4 consecutive sprays. During the vegetative growth period, apply more nitrogen and potassium fertilizer; during flower bud formation, apply more phosphorus fertilizer. Different fertilizer types have different effects when sprayed at different times. For example, boron fertilizer and zinc fertilizer sprayed at the early flowering stage, and molybdenum fertilizer sprayed before flowering, give relatively good results.
2. Fertilizer types: To make flowers large and colorful and fruits abundant with lush leaves, you must first meet their needs for the three main nutrient elements nitrogen, phosphorus, and potassium, and at the same time they must not lack other trace elements such as calcium, magnesium, sulfur, iron, zinc, boron, molybdenum, copper, manganese, and so on. Fertilizer types commonly used for foliar feeding include: for nitrogen deficiency, spray urea, ammonium sulfate, ammonium nitrate; for phosphorus deficiency, spray potassium dihydrogen phosphate, superphosphate, ammonium phosphate, potassium phosphate; for potassium deficiency, spray potassium nitrate, potassium chloride (not for bulbous flowers); for calcium deficiency, spray superphosphate; for magnesium deficiency, spray magnesium sulfate; for sulfur deficiency, spray potassium sulfate; for iron deficiency, spray ferrous sulfate; for zinc deficiency, spray zinc sulfate; for boron deficiency, spray boric acid; for molybdenum deficiency, spray ammonium molybdate; for copper deficiency, spray copper sulfate; for manganese deficiency, spray manganese sulfate.
How to Care for Gardenia in Winter
The gardenia does not like winter; in winter it begins to go dormant. During this period, if you find the gardenia's leaves dropping or no longer growing, do not panic, as this is a normal phenomenon. You can put it in a room where the temperature does not exceed 12°C, letting the gardenia pass the winter safely.
But the lowest temperature should not be below 6°C. Let the gardenia see sunlight. Even in winter, let it feel the warmth of the sun, but the sunlight should not be too strong.
How to Prune Gardenia
For pruning, you actually need to be careful: do not cut too much each time. Just remove the leaves at the tip, and only two or three pairs at that. There are also some other points to note. If it is growing very vigorously but has branches with a bad direction and poor growth, then you should also properly cut off these poor ones. Of course, if branches are withered, some are pest-damaged, and crossing and overlapping branches, all should be cut off.
To make the gardenia grow well, besides careful care and reasonable fertilizing, timely pruning is also very important for it. If you do not promptly prune the spots where disease appears or the old roots, over time this will affect its health and lead to its death, so this point requires special attention.