Grow rambutan in full sun with humid air and a frost-free year, and keep the soil moist. It is also called hairy lychee. The genus is Nephelium.
Give it full sun, humid air, and a frost-free year
| Factor | Recommended | Avoid |
|---|---|---|
| Light | Full sun all day for growth and fruit | Do not site it in shade if you want a crop |
| Water | Keep the soil moist for a young tree; once it bears, water from bloom through fruit fill, then use a short dry spell so flowers can start | Do not let a young tree dry out for days, and do not leave the roots in standing water |
| Soil | Acid to neutral loam or sand that drains, with humid air around the canopy | Do not plant it in a flood pocket, and do not site it in a dry wind |
| Winter | A frost-free site year-round; cover a young tree, or roll a pot under cover, before a freeze | Do not leave a young tree out through a freeze, and do not treat it like a lychee that wants a cool winter |
Rambutan wants heat, sun, and humid air all year. Dry wind browns the leaf edges, and a freeze kills a young tree. [1] rambutan is Nephelium lappaceum, an evergreen tree in the soapberry family with compound leaves and fruit covered in soft spines. It is a lowland tropical tree, not a warm-subtropical lychee that blooms after a cool, dry winter. [2] In a frost-free humid climate the tree can flower more than once after a drier spell, then fill fruit if you water again. [3] Plant the tree on Planting Rambutan. Cut after harvest on Pruning Rambutan.
How much sun does a rambutan tree need?
Give it full sun all day. Shade makes a thin crop and weak wood.
Keep the soil moist, then dry it briefly so it can bloom
A newly planted rambutan has a small root system, so a dry week in the first years sets it back. Soak the soil, then let the surface dry slightly before you water again. Do not leave the hole flooded. Once the tree is bearing, water from the first bloom through fruit fill so the aril can swell. After the crop is off, ease off so a short dry spell can start the next flower clusters, then water again when those clusters appear. [4]
- Water a young tree regularly until it is established, especially in a dry week.
- Once flowers open, water from bloom through fruit fill so fruit does not drop small.
- After the crop is off, ease off until the newest leaves have hardened, then water again so flower clusters can start.
- Do not flood the hole, and do not run a lawn sprinkler on a timer against the trunk.
How often do I water a rambutan tree?
Keep a young tree moist. Once it bears, water from bloom through fruit fill, then ease off for a short dry spell so it can set flower.
Keep a young tree in a pot you can move
A young rambutan can live in a pot with a drainage hole while you protect it from a cold night. Open ground in a frost-free, humid site is still the home for a fruiting tree.
- Use a pot with a drainage hole, large enough for the nursery can it came in.
- Fill it with a mix that drains, and set the mix even with the old soil line.
- Keep the pot in full sun outdoors in warm, humid weather.
- Roll it under cover before a freeze, then move it back out once nights stay warm.
- Do not try to fruit it as a houseplant in a dim room.
Can I grow rambutan in a pot?
Yes, while the tree is small and you need to move it from a cold night. Give it a drainage hole, full sun, and mix that drains. Open ground is better once it is too heavy to roll.
Not lychee — and not longan
Lychee is Litchi chinensis, a cousin with a warty pink-red peel and no hair-like spines. It blooms after a cool, dry, frost-free winter. If the tag is lychee, read How to Grow Lychee.
Longan is Dimocarpus longan, with a smooth tan peel. If that is the fruit you want, read How to Grow Longan. Ackee is a more distant relative grown for a splitting pod; read How to Grow Ackee if that is the crop. Pulasan is a related Nephelium with shorter spines, not this rambutan card.
Is rambutan the same as lychee?
No. Rambutan has a peel covered in soft spines. Lychee has warty pink-red skin and wants a cool winter to bloom. They are related, not the same tree.
Keep the soil moist from bloom through fruit fill, then ease off for a short dry spell so the next flowers can start.
FAQ
Is pulasan a different plant?
Pulasan is a related fruit with shorter spines. It is not this rambutan.
Are Rongrien and R3 different plants?
Those are named rambutan cultivars, not a second species. They want the same sun, humid air, and frost-free year as this tree.
Related guides
Recommended plants
References
- [1] World Agroforestry Centre -
https://apps.worldagroforestry.org/treedb2/AFTPDFS/Nephelium_lappaceum.PDF - [2] Food and Agriculture Organization -
https://www.fao.org/4/ac681e/ac681e04.htm - [3] University of Hawaiʻi at Hilo -
https://hilo.hawaii.edu/academics/cafnrm/research/documents/Kawabata_000.pdf - [4] International Tropical Fruits Network -
http://www.itfnet.org/gfruit/Templates%20English/rambutan.agro.crop.htm
This note is part of Nephelium Guides.
More first-season notes by plant are gathered in How to Grow Guides.
Updated: Reviewed by Bosquelle Editors