Rubiaceae Gardenia: Is It Easy to Grow? Countermeasures for Wilting Yellow Leaves and Reasons for Not Blooming

Gardenia is also known as gardenia and yellow gardenia, belonging to the order Gentianales, family Rubiaceae. Gardenia grows the same throughout the four seasons, with evergreen leaves, and when it blooms it is fragrant and elegant, with white flowers appearing white, looking especially clear and beautiful, very likable. So is gardenia easy to grow? The leaves have wilted, what to do when they turn yellow? What are the reasons for not blooming?

What is usually called gardenia refers to the ornamental double-petaled variety, the large-flowered gardenia. The leaves are leathery, long oval, and glossy. The flowers are axillary, with short stalks, and fleshy. The fruit is oval to long oval, with 5-9 winged straight ridges, 1 locule, and many seeds, embedded in a fleshy placenta. It blooms from May to July, and the flowers, leaves, and fruit are all beautiful, with the flowers full of fragrance. The roots, leaves, and fruit can all be used as medicine, with effects of purging fire and relieving restlessness, clearing heat and promoting urination, cooling blood and detoxifying. Its fruit can be used to make paint for painting.

Gardenia planting and care points

First, soil: For planting gardenia, it is best to choose acid soil for cultivation. Alkaline soil will prevent gardenia from absorbing iron well, thereby greatly affecting the formation of chlorophyll, further causing branches to wither and even die; so its soil must be loose, fertile acidic soil, and some substances with this effect can also be added to it.

Second, environment

It is best to place gardenia where it can maintain 60% light daily. After entering April, fertilize twice a month.

Third, air humidity and watering

Gardenia likes moisture, so the air must not be too dry; too dry will affect the opening of the flowers. Too wet will cause the roots and stems to rot and the leaves to turn yellow. So in addition to normal watering, also frequently spray clean water nearby. At the same time, when watering, uphold the principle of “water when dry, and when watering, water thoroughly.” When you see the soil is dry, tap the flower pot with your hand; if there is a hollow sound, it needs watering, and stop when the bottom of the pot starts to leak. It is best if the water used can have some egg or soy milk added, as this is more conducive to growth.

Fourth, key points for fertilizing

Gardenia likes fertilizer, but follow the principle of “light fertilizer, applied often,” otherwise too much fertilizer will cause thick branches, large leaves, and deep green color, and it will lose its own ornamental effect.

Fifth, temperature requirements

The ideal growing temperature for gardenia is 18 to 22°C, and 5 to 10°C in winter. If it is below minus 10 degrees, it will be frostbitten, and the north should pay special attention to this.

Sixth, proper pruning

Gardenia should be pruned often to avoid leggy growth, which affects its appearance. When pruning, it is best to keep 3 main branches, and cut off new shoots sprouting from root suckers at any time. After the flowers fade, the branches should be cut short in time, so that new branches will sprout below the cut. When the new branches grow three nodes, pinch them back to avoid blind growth.

Seventh, disease prevention

1. Iron deficiency, this is the most common kind. Iron deficiency will affect the formation of chlorophyll, then cause the leaves to lose green. At this time, you can use ferrous sulfate water and low-concentration black alum water, three times a month.

2. Magnesium deficiency. Magnesium deficiency will cause the veins of the lower old leaves of gardenia to turn yellow. At this time, it is necessary to spray with a low-concentration magnesium sulfate solution.

3. Soil too wet or too dry, this can refer to point three

4. Direct sun exposure, this can refer to point two.

Eighth, propagation methods

Gardenia generally has two propagation methods: cuttings and layering

1. Cuttings: in the plum rain season, use young branches 15 cm long, insert them into the seedbed, and they will root in 10-12 days.

2. Layering: in April, select two-year-old branches, 2O-25 cm long, bury them in the soil, keep them moist, and they will root in about 3O days. Separate them from the mother plant in summer and plant them separately the following spring.

What to do when gardenia leaves wilt?

1. Soil reason: If gardenia leaves wilt because of the soil, then you should replace the nutrient soil and change to slightly acidic soil suitable for its growth, and it must be rich in humus.

2. Light problem: Gardenia likes light but cannot be exposed to strong light. Sun exposure will cause the leaves to wilt and turn yellow. In summer, it should be placed in a semi-shaded place to avoid strong light.

3. Improper watering: Gardenia has relatively high water requirements and needs sufficient water. In summer afternoons it needs more watering, but the water quality must not be too hard, otherwise it will also cause the leaves to wilt.

4. Fertilizing problem: If gardenia cannot get enough nutrients, it will also cause the leaves to wilt, but fertilizing should be moderate, not excessive, and during the plant's growing period, fertilize reasonably along with watering.

5. Pests and diseases: Gardenia is prone to aphids, whiteflies, scale insects, and other damage, so pay attention to pest prevention and carry out regular treatment to avoid the leaves being damaged.

What to do when gardenia leaves turn yellow?

1. Improper watering: If too much water is given during gardenia cultivation, then the young leaves will be dull and lusterless, while the old leaves are unaffected, but the leaves will be yellow-green, and new leaves will not grow.

Remove the plant from the pot and place it in a ventilated, shaded place until the soil ball dries, then put it back in the pot. When there is a lack of water, the leaf tips or edges become withered and dry, the old leaves wither and yellow from bottom to top and fall off, and new leaves grow relatively normally. At this time, water enough and water thoroughly.

2. Improper light: Too strong light causes yellow spots on the light-facing side of the leaves, and they can recover if placed in a dark place. If gardenia is placed in a shaded environment for a long time, then the leaves will turn yellow or fall off because they cannot get enough sunlight. It is best to supplement light immediately.

3. Improper fertilizing: Pay attention when fertilizing during gardenia cultivation. Too much or too high a concentration can easily cause the plant to turn yellow. The tips of new leaves will appear brown, generally the leaf surface is thick and lusterless, and uneven and not smooth, while old leaves scorch, yellow, and fall off. At this time, you should water more to reduce the soil's fertilizer concentration.

Insufficient fertilizer in gardenia can also cause the plant to turn yellow, but depending on the nutrient component the plant lacks, the symptoms are different as follows.

① Nitrogen deficiency: When the plant lacks nitrogen, the leaves simply turn yellow, and new leaves are small and brittle.

② Potassium deficiency: When the plant lacks potassium, the old leaves change from green to brown.

③ Iron deficiency: At first the leaves are pale yellow or white, while the veins remain green. In severe cases, the veins also turn yellow or white, and eventually the leaves dry up and die. For this situation, spray 0.2%-0.5% ferrous sulfate aqueous solution for prevention and control.

④ Magnesium deficiency: Yellowing starts from the old leaves and gradually develops toward the new leaves, while the veins remain green. In severe cases, the leaves fall off and the plant dies. It can be sprayed with .7% to .8% boron-magnesium fertilizer for prevention and control.

⑤ Phosphorus deficiency: Old leaves appear purplish red or dark red.

4. Too low temperature: Too low a temperature can also cause leaf yellowing, so during gardenia cultivation, pay attention to frost protection in winter, and also pay attention to keeping warm at night in early spring and early winter.

5. Lack of ventilation: The growing environment of gardenia needs to be ventilated and moist, with bright light. If windows are often not opened, yellowing at the leaf edges can also appear. Therefore, remember to open the windows every day for ventilation.

Reasons why gardenia does not bloom

1. Unsuitable water and fertilizer

Excessive water and fertilizer cause the plant to grow leggy (growing taller but not stronger). Such weak branches certainly cannot produce flower buds, resulting in no blooming or very little blooming; some that do bloom may even fall off immediately. During the flower bud differentiation stage, pay special attention to the combination of phosphorus and potassium fertilizers, such as 0.2% potassium dihydrogen phosphate solution, which is beneficial to flower bud formation and budding; fertilizing too heavily during the budding stage, or watering erratically, will also cause flower and seedling drop.

2. Improper light

Gardenia is a shade-loving plant. Occasionally give it some light. Shade it in summer, and in winter appropriately give it light. Too strong or too weak light will affect gardenia blooming.

3. Soil with high alkalinity

Gardenia likes slightly acidic soil. If the potting soil has high salt and alkali content, the plant's leaves will turn yellow, affecting blooming.

4. Too dense and not pruned

Gardenia branches are messy. A large number of miscellaneous branches consume a large amount of nutrients, and branches that are too dense affect photosynthesis. Both are important reasons for not blooming.