How to Grow Vanda Orchids? Detailed Guide to Cultivation Methods and Precautions

Vanda orchids like to grow in warm places and are currently distributed in many parts of our country. Vanda orchids are very popular among consumers on the market today, and people mainly grow them for ornamental purposes. However, during the cultivation process, it is also necessary to master some techniques, otherwise it will cause some problems, and in serious cases it will cause the death of the plant.

How to Grow Vanda Orchids

1. Potting medium: The roots of Vanda orchids are aerial roots, and any medium with good drainage can be used, such as osmunda fiber, crushed brick, charcoal, coarse gravel, etc. Whether used alone or mixed, they are all good potting media.

2. Light: Vanda orchids usually need relatively strong light. In local high-temperature seasons, a 40-50% shade net is needed for shading, while in winter no shading is even needed.

3. Temperature: Vanda orchids like high-temperature environments, with the most suitable temperature being 20-30°C. In summer, temperatures as high as 35°C have little effect on their growth.

Vanda Orchid Cultivation Methods and Precautions

I. Cultivation methods:

1. Watering: Near the flowering period, watering should be reduced for Vanda orchids to promote flower bud differentiation. In summer, water every 1-2 days in the morning or evening; in winter, water about once every 3-5 days. Stop watering when a cold snap arrives. It is best to water thoroughly in one go, and water again after the medium dries. Normally, maintain air humidity at 60-80%.

2. Fertilizing: In spring and autumn, apply slow-release fertilizer to Vanda orchids. Normally, use water-soluble liquid fertilizer diluted 1000-2000 times and spray once every 10-15 days. For small seedlings, use fertilizer with an N-P-K ratio of 3:1:1; for medium to large seedlings, use an N-P-K ratio of 1:1:1; for flowering plants, use an N-P-K ratio of 1:3:2. Follow the principle of applying thin fertilizer frequently to prevent fertilizer burn.

3. Repotting: Vanda orchids should not be repotted frequently. Unless affected by pests or diseases, they should be repotted at least only once every 3 years. In spring, Vanda orchids are about to enter their vigorous growth period, making it a good time to repot.

II. Precautions:

Vanda orchids need to be planted in a medium with good ventilation and drainage. Sphagnum moss (water moss), osmunda fiber, pine bark, and small stones are all acceptable. Repot about once every two years in spring or autumn. Before planting, soak the medium in water for 1-2 days, then dry it in the sun before use for better results.

What to Do If Vanda Orchid Leaves Turn Yellow

1. Water-induced yellowing. Water-induced yellowing is caused by long-term water accumulation in the pot making the soil too wet, resulting in a lack of oxygen in the soil. This condition causes a small portion of the roots to rot, and also leads to poorer water absorption capacity and weakened fertilizer absorption capacity. New tender leaves appear dark yellow with no gloss on the surface. The tips of new leaf shoots shrink, and the stems become small and appear yellow-green.

Treatment: Loosen the soil in time, reduce watering, and stop using fertilizer. In severe cases, remove the soil and plant from the pot, let them dry, and then put them back.

2. Fertilizer-induced yellowing. Fertilizer-induced yellowing is caused by excessive fertilization, especially nitrogen fertilizer causing leaves to turn yellow. In this situation, new leaves are large and thick with extra gloss, the leaf surface is uneven, and old leaves gradually turn yellow and fall off.

Treatment: Stop fertilizing and appropriately increase watering to dilute the nutrients. When fertilizer is insufficient, or when the plant is large and the pot is small, or when the roots in the pot age and become too crowded, the leaves of the plant will become thin and yellow. Change the potting soil, which is generally best done from the Rain Water solar term to the Beginning of Summer solar term.

Vanda Orchid Diseases and Prevention

1. Soft rot. Prevention and treatment: Improve growing conditions, increase ventilation, and lower temperature and humidity. Cut off the affected parts, apply antibiotic powder, and do not water for one week to stop the spread of the disease. Use streptomycin diluted 1000 times in water, or lime sulfur mixture or Bordeaux mixture diluted 500 times in water, and spray once a week.

2. Leaf blight. Prevention and treatment: Cut off diseased leaves and spray with Daconil-45 diluted 500 times or Good Vegetable diluted 1000 times. For affected plants, avoid rain or temporarily stop watering to prevent the condition from worsening. Spray Daconil-45 diluted 500 times once daily on a regular basis as a preventive measure.

When cultivating Vanda orchids, be sure to pay attention to temperature control. When winter temperatures are low, move them indoors; when summer temperatures are high, provide shade. If yellowing leaves appear during the cultivation of Vanda orchids, first find out the cause, and then solve the problem at its root.