How to Grow and Care for Fragrant Osmanthus in Pots

Osmanthus is a tree of the genus Osmanthus, with many varieties, the most representative being golden osmanthus, silver osmanthus, red osmanthus, and sweet osmanthus. Osmanthus is also one of China's ten traditional famous flowers, with a sweet fragrance that fills the air for ten li. So what are the growing methods and precautions for potted osmanthus? Let's take a look together!

I. Growing Methods for Potted Osmanthus

1. Potting Soil

Osmanthus does not have high requirements for soil. The potting soil can be a mix of humus soil or peat, garden soil, and sandy soil or river sand in a 5:3:2 ratio, with the pH kept at 5.5-6.5. Before potting, the growing medium should be sprayed with a 0.1% potassium permanganate solution for disinfection.

2. Watering

Osmanthus does not need much water. Watering should follow the principle of not watering until dry, and watering thoroughly when you do. Spray the leaves with clean water once a day. In summer, when temperatures are high and evaporation is great, it is best to water in the morning and evening; in winter, water around noon. Be careful to water in moderation and avoid waterlogging.

3. Fertilizing

Osmanthus should be given sufficient fertilizer; if nutrients are insufficient, the flowers will not do well. Apply nitrogen fertilizer once when new shoots emerge, and mainly phosphorus fertilizer before flower bud differentiation and flowering. It is worth noting that after fertilizing, water thoroughly.

3. Repotting

Osmanthus usually needs to be repotted and have its soil changed every 2-3 years. Trim away some old roots, dead roots, and diseased roots, and place a layer of river sand or vermiculite at the bottom of the pot to improve air and water permeability. Place decomposed cake fertilizer as a base fertilizer, turn the soil to prevent it from becoming compacted, and firm down the fine soil.

4. Pruning

It is best to prune osmanthus after autumn. Thin out plants whose branches are too dense, and after flowering also cut away leggy branches, dead branches, diseased and pest-infested branches, and dense, weak branches to strengthen growth.

5. Overwintering

The best temperature for overwintering osmanthus is around 5 degrees, with a relative humidity of 50-80%. In winter, osmanthus needs good light, especially before the buds begin to sprout in early spring, when even more sunlight is required. After Grain Rain, it can be moved outdoors; after being brought out, first place it together in a wind-sheltered, sunny spot outdoors.

6. Diseases

Common diseases of osmanthus include leaf spot, sooty mold, algal leaf spot, root rot, and iron deficiency. For leaf spot, sooty mold, and algal leaf spot, Bordeaux mixture or carbendazim can be sprayed for control. For root rot, keep the soil loose and airy and avoid waterlogging.

7. Pests

Common pests of osmanthus include sawflies, whiteflies, mites, white peach scale, and yellow stinging caterpillars. Sawflies, whiteflies, and mites can be killed by spraying dimethoate. For white peach scale, besides manual brushing off, omethoate or fenitrothion can be sprayed for control during the first and second nymph stages.

II. Precautions for Potted Osmanthus

1. Water management for potted osmanthus is more difficult than for field-grown plants. Overwatering often causes leggy growth, while poor drainage and water accumulation in the pot easily cause root rot. Therefore, be sure not to water too much; even during the flowering period, when water needs are greater, avoid making the potting soil too wet.

2. Osmanthus is a long-day plant and loves light. If the plant cannot get sufficient light, its branches and leaves will grow leggy, affecting flower bud formation, and it will not bloom. So when growing osmanthus, provide more light so it can bloom abundantly during the flowering period.

3. If potted osmanthus is not repotted and its soil not changed for years, the plant will suffer from insufficient nutrients, and the roots will become bound and unable to spread, affecting flowering. Therefore, potted osmanthus should be repotted once every 1 to 2 years, and throughout the growing period more phosphorus and potassium fertilizer should be applied.

4. After potted osmanthus is brought indoors for winter, it should be placed in a low-temperature spot to let it go dormant. If the room temperature is high, the osmanthus will not get sufficient dormancy, which will make it sprout and unfurl leaves early, leading to weak branches and consuming a great deal of nutrients; after being moved outdoors in spring, it may easily shrivel and die when it encounters dry wind.

5. Potted osmanthus is not tolerant of smoke and dust. If it grows in a place with polluted air and heavy dust, it will grow poorly, with leaves becoming smaller and yellow and prone to dropping, and it will bloom little or not at all. Therefore, when growing it, prevent the osmanthus from being polluted by smoke and dust, and keep it in a ventilated place with fresh air as much as possible.

The above are the growing methods and precautions for osmanthus summarized for you by the editor. We hope they can help you.