Telosma cordata (commonly known as Tonkin jasmine or Chinese violet) is widely favored in cooking for its sweet, refreshing soups and stir-fried dishes. It is a climbing vine that produces fragrant flower clusters that are easy to eat and rich in nutritional value—containing vitamins, iron, and various essential minerals highly beneficial to health.

How to Plant Telosma Cordata

Key Essentials to Know Before Planting

Telosma cordata is quite easy to grow; a single planting can yield multiple harvests over several consecutive years. It can be cultivated in open fields or at home using styrofoam boxes or plastic pots with a minimum width of 30 cm and a depth of 60 cm.

The plant is a light-loving and moisture-loving vine that requires frequent watering. However, it tolerates cold poorly and cannot withstand waterlogging during heavy rain periods. The ideal time for planting is during the spring season, with optimal temperatures ranging between 20°C and 35°C (68°F–95°C).

Telosma cordata vines must be planted in airy, well-lit locations.

• Propagation: Grown via stem cuttings; select branches that are neither too old nor too young to serve as planting cuttings.

• Location: Must be open, well-ventilated, well-lit, and spacious enough to support a trellis for the climbing vines. Planting near fences or perimeter walls is recommended.

• Soil: Suitable for sandy loam soil with good looseness and moisture absorption capacity. Care must be taken to prevent waterlogging, which causes root rot.

Planting Season

While propagation can occur year-round, the best time is during the Dongzhi (Winter Solstice) period—matching the exact time for pruning small vines and sterilizing plants that are 2 years or older.

Selection and Nursery Propagation

Choose mature vines (grey bark with wrinkled patterns) free of diseases, with a minimum diameter of 6–7 mm (10 mm is ideal).

1. Cutting options:

   • Cut short segments (cuttings) around 30 cm long for nursery bags.

   • Cut long segments (80–100 cm) to coil into pots or plant directly into prepared planting holes.

2. Treatment: After cutting, dip the cut ends in wood ash (or incense ash) to stop sap flow, prevent dehydration, and disinfect before planting.

3. Planting Depth: Leave 10 cm of the cutting exposed above the soil line.

4. Care: Maintain adequate moisture and protect the plants from frost through the Xiaohan (Lesser Cold) and Dahan (Greater Cold) solar terms. Cover the nursery site to prevent accidental damage from people or animals. Insert stakes for the vines to climb, keeping only 2 main shoots to grow onto the trellis.

Field / Open Land Cultivation

Select sandy loam soil with easy irrigation and drainage. Ensure the surrounding area is free from large trees or high mountains that block sunlight.

1. Raised Beds: Form raised beds 40 cm high and 40 cm wide.

2. Planting Holes: Dig holes measuring 20 x 30 cm spaced 3 meters apart; place well-rotted manure at the bottom as basal fertilizer.

3. Transplanting: Transplant the nursery plants when the vines reach 50–60 cm in height.

4. Trellis Area: Each plant base requires a trellis area of approximately 10–12m2 (preferably a slightly tilted, two-sloped roof style aligned North–South).

For field or open land cultivation, choose sandy loam soil with good irrigation and drainage.

Home Cultivation

For urban homes or areas with limited land space:

1. Container Construction: Build a planter box at least 30 cm high, 30 cm wide, and 100 cm long.

2. Layering: Dig down 50 cm. Place a layer of coconut husks (with juice already extracted) at the bottom. Alternate layers of coconut coir fiber with 10 cm layers of soil (to facilitate drainage and create organic fertilizer later).

3. Planting: Plant the developed vine nursery seedling (vine length ~50 cm) and cover the root ball with soil (level with the ground surface, 30 cm from the container wall).

Trellis Configurations

• Low Trellises: Choose a spot free from large trees or adjacent high walls that block sunlight. The site must receive at least 4–6 hours of direct sunlight daily. Tilt the trellis slightly toward the sunny angle.

• Rooftop Trellises: Build a two-sloped roof-style trellis with a incline of about 8–10° to withstand strong winds while catching full-day sunlight. Tie guiding strings for the vines to climb.

  • Note: Unbind and slacken the guide strings once a week before the vine reaches the trellis to check for aphids. Once the vine reaches the trellis and branches out, guide strings are no longer needed.

Plant Care Guidelines

• Irrigation: Maintain sufficient moisture; drain standing water immediately to avoid waterlogging.

• Top Dressing: Once the main vine grows 2 meters high and the root system is established, top-dress using diluted urine (1:20 ratio), watering 60 cm away from the base.

• Branching: Allow side branches to develop only after the vine extends 50 cm onto the trellis. Proactively guide branches to cover the trellis evenly without intertwining tightly.

• Pruning: Regularly prune old leaves, compost them, and feed them back to the soil. From the second year onward, cut off all small vines and leaves during the Dongzhi (Winter Solstice) period to eradicate pathogens and protect against cold.

Pests, Diseases, and Management

1. Aphids (Most Dangerous)

If not controlled promptly, the plant will fail to produce harvestable flowers.

• Inspection: Check daily starting from the onset of leaf growth. Kill aphids manually by hand.

• Removal Method: For heavy infestations, use a soft brush (a shaving brush or quality paintbrush) to sweep aphids onto stiff cardboard and burn them.

• Flower Bud Care: When buds appear, check for aphids hiding inside cluster crevices; use a sharp toothpick to push them out and destroy them.

2. Sooty Mold / Powdery Fungus (Black Mold)

Appears as black soot on leaves and vines, particularly in dense foliage clusters. It causes sap leakage and weakens the plant (typically developing during the flowering season from July onward).

• Prevention: Avoid dense, multi-layered foliage. Harvest young leaves for cooking and remove old leaves for fertilizer.

• Treatment: If black mold appears, pluck all infected leaves, dust them with lime powder, and bury them. Mix a lime-water solution and brush it onto affected vines.