GARDENIA JASMINOIDES

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GARDENIA JASMINOIDES

Gardenias should be planted in well conditioned soil containing peat moss and compost. Cultivating around the plants may damage their shallow roots, so the plant should be mulched with 2 to 3 inches of wood chips, sawdust or ground bark to keep the soil moist, cool and weed free. Feed the plants every three weeks during the growing season with a rhododendron-azalea food, or acidifying fertilizer. (Miracid) Proper temperatures are necessary for a gardenia to bloom. This is the most critical aspect. Flower buds will fail to form if day temperatures are higher than 70degrees or night temperatures are over 65 degrees or less than 60 degrees. The ideal temperature ranges would be 65 to 70 degrees during the day and 60 to 62 degrees at night.
Gardenias can be pruned as far back as you like but you should keep a few important details in mind. First, cut plants back when they are dormant ( depending upon where you live). This will allow the stems to "heal their wounds" when the plants aren't actively growing. This way you can still enjoy flowers the next year. When pruning, don't cut all the leaves off. Some leaves need to be left so the plant can still produce food for the root system. The following spring, use an acidic fertilizer with chealeted iron and high nitrogen so the plant can produce healthy leaves and buds. If you only want your plant to become bushier, simply pinch out the tips while the plant is dormant. Pinching will usually promote a heavier bloom the following year.
If you are growing your Gardenia as a potted plant indoors, keep it out of direct, hot sun, and allow it to only get bright light.
I think that your 'black mold' is more than likely an algae growth, which is a cosmetic problem for your plant rather than a health problem. This could be caused by insufficient air circulation, or possibly lack of sun. Unfortunately, in your situation, the only way to remove this growth is by hand washing each leaf.

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