Setting up a new durian orchard: soil, ditches, banks and seedlings

70% of the risk of durian orchard failure comes from the establishment stage. Guidance on making the right investment decisions from soil surveying, cultivating, choosing varieties to planting — based on orchard experience in the West and Southeast.

Summary: Durian is not a tree to "grow for fun". A mistake at the establishment stage (choosing the wrong land, growing low tissue, choosing varieties not suitable for the region) will lead to 5-10 years of damage. This article summarizes a decision checklist before sowing seeds — clearly distinguishing suitable land from "should-be-avoided" land, helping to avoid the most costly mistakes.

Applies to: Areas planning to grow new durian (Tien Giang, Ben Tre, Vinh Long, Dak Lak, Lam Dong, Binh Phuoc). Renovating a mixed orchard can also use most of the content.
Duration: 6-12 months (survey + preparation + planting + first 6 months).
Difficulty level: Advanced. Big investment + can't fix much after sowing.
Estimated additional costs: 80-150 million/ha (land, mound, ditch, seedlings, irrigation system).

First decision — is the land suitable

This is an irreversible decision. The land is bad, the amount of investment later cannot compensate. Two mandatory criteria:

Altitude + drainage: Durian cannot stand being waterlogged even for just a few hours. The land must have a natural or elevated elevation of at least 60-80cm above the highest water level of the year. Areas flooded 30-50cm in flood season → need to build 120cm or more + ditch 100cm deep.

pH + gas release: KCl pH 5.5-6.5 is the optimal zone. Acidic soil (pH < 5) must be limed at 2-3 tons/ha before sowing. Clay soil holds air → roots suffocate, durian hates closed soil structure.

Land "stay away":

Heavy alkaline soil (pH < 4 + high sulfate) — cannot be economically improved.
Sandy soil drains too much — water is wasted and nutrients run away quickly.
Land close to main road/industrial park — dust + pollution affects export quality.
Land used to grow rubber and cashew trees is heavily infected with nematodes — must let the land rest for ≥ 2 years.

Before buying land or renovating, mandatory sampling for analysis: pH, OC%, P, K, Ca/Mg, CEC, nematodes. Cost 1-2 million, saves risks dozens of times.

Overall design — decide before digging

[ ] orchard map: draw on paper or Google Earth, mark elevation, sun direction, main wind direction, water source, access road.
[ ] Plot division: divide the orchard into plots of 0.5-1 ha. Each lot has a 3-4m walkway for motor vehicles and harvesting vehicles to enter.
[ ] Main ditch system is ≥ 80cm deep, secondary ditch is 50-60cm deep. The ditch must have an outlet to a large ditch outside the orchard.
[ ] Planting density: 8m × 8m (156 trees/ha) for small canopy varieties. 9m × 10m (111 trees/ha) for Monthong, Musang King large canopy. Don't plant too thickly — after 7-10 years the tree is covered and the yield decreases.
[ ] Planting direction: rows in East-West direction if terrain allows — optimal light.
[ ] Irrigation system: designed from the beginning, not upgraded gradually. Root / drip irrigation nozzle + backup pump + storage tank.

Investing an irrigation system from the beginning is about 25-40 million/ha depending on the scale. This money cannot be saved — if the orchard grows large and is watered poorly or irregularly, the consequences will be 5-10 times greater.

Timeline

Month 0-3: Land reclamation

After deciding to plant, do not sow seeds immediately. Base fertilization + renovation:

Digging ditches, building motifs according to the design map.
Lime 1-2 tons/ha spread evenly over the tissue surface + plowing (if pH < 5.5).
Organic fertilizer 30-50 tons/ha. This is nutrition for the first 5 years, no savings.
Apply fused phosphate 500-800 kg/ha — phosphate remains in the soil for many years.
Water evenly and let soil microorganisms recover 30-60 days before sowing.

March: Choose + place seedlings

Choosing a breed is a long-term decision. Principle:

Buy seeds of clear origin from a certified nursery. Tree 12-18 months old, 50-80cm tall, strong rootstock, stable old leaves.
Type of plant: seedling from seed = not recommended (takes a long time to bear fruit, unstable characteristics). Tree grafted on healthy rootstock = standard.
Variety distribution: 1 hectare orchard should have 1 main variety (60-70%) + 1-2 secondary varieties. Helps cross-pollination + reduces market risk of one variety.

Suggested variety distribution by region:

Southwest: Main Ri6 + Secondary Monthong/Thai Dona.
Southeast + Central Highlands: Monthong + Ri6.
Highlands with lakes: Musang King tested (high risk, good price).

March-April: Planting + first month after planting

Dig a hole in the prepared tissue, size 40x40x40cm. Place the tree so that the root collar is 5-10cm above the tissue surface — most importantly, it should not sink too deep.

After planting:

Place a stake to keep the tree straight. A leaning tree will affect its canopy structure for life.
Much with straw, hay, rice husks — retain moisture + reduce weeds. Leave 5cm around the root neck.
Irrigate 5-10 liters/tree every 2-3 days in the first month. Don't water too much.
Temporarily shade 30-50% with nets or short-term shade plants for 3-6 months. Newly planted trees do not tolerate direct sunlight at noon.

April-December: Tracking + basic canopy creation

Target survival rate ≥ 95%. Trees die in the first month = replant right from the backup orchard (have trees from the beginning).

Creating a canopy: leave 1 main stem, the first 3-4 level 1 branches 80-100cm above the ground. Level 1 branches are divided evenly around the trunk, without overlapping.

Follow-up for the first 6 months

[ ] Survival rate weeks 1, 4, 12.
[ ] Growth — measure height, stem diameter, number of leaves per month.
[ ] Root disease + root fungus — observe every 2 weeks. Young durian is very sensitive.
[ ] Early season insects: ants, termites, armyworms that eat young leaves.
[ ] Ditch + drainage condition after each heavy rain.

Common mistakes of newly established orchards

Greed for planting thickly: want to quickly get income → 200 trees/ha. After 5-7 years of cover, productivity clearly decreases. The lessons of Tien Giang region 2018-2020 are too clear.

Believe the dealer's "miracle fertilizer": new orchards do not need strong chemical fertilizers. Organic background + balanced nutrition is much more important.

Skip soil analysis before planting: costs 1-2 million but helps avoid a lot of damage later.

Planting too small seedlings (< 30cm) to save money on seeds: high mortality rate + weak plants for many years.

There is no backup orchard of seedlings: when trees die, there are no replacement trees of the same variety of the same age → the orchard is uneven.

Economic decisions to consider

Before sowing, calculate:

Initial investment: 80-150 million/ha (as above).
Operating costs/year: 30-50 million/ha for the first 3 years without revenue.
Payback time: 5-7 years from planting date.
Age for stable income: years 7-15.
Economic life cycle: 25-35 years.

Total investment for 1 hectare of durian for stable harvest: 250-400 million. This is not a small investment. Consider financial capacity + cash flow in the first 5 years before deciding.

New orchard records — laying the foundation for permanent data

orchard map + GPS coordinates for each plot.
Initial soil analysis results.
Seed source + planting date + quantity of each variety.
Amount of land improvement materials + costs.
Photo before planting + immediately after planting each plot.

This data follows a 30-year tree. Lost cannot be recreated.

Reference

*Technical process of growing durian* — Southern Fruit Institute, 2023.
*Durian export technical manual* — Department of Crop Production, 2024.