How to Grow Dragon Fruit Tree - Complete Guide

It is not a tree

Worth clearing up first, because it changes everything about how you grow it. Dragon fruit is not a tree — it is a climbing, vining cactus. In the wild it scrambles up rainforest trees and rock faces, anchoring itself with aerial roots as it goes. It has no woody trunk and cannot support itself once it gains any size.

The practical consequence is that you must build it something to climb before you plant it, not after. A mature plant can carry 50 kg or more of stem, and retrofitting support to a sprawling three-metre cactus is a genuinely unpleasant job.

Cuttings, not seed

You can grow dragon fruit from seed, and it is an easy, satisfying germination — scrape seeds from the flesh, rinse the pulp off, sow on damp seed compost, and they sprout in one to three weeks. But it is almost always the wrong choice.

• Seed-grown plants take five to seven years to fruit. Cuttings take one to three.
• Seedlings do not come true to type. Dragon fruit cultivars are hybrids; seeds from a good fruit produce a genetic lottery, and most results are worse than the parent.

Grow from seed for the interest of it. Grow from a cutting if you want fruit.

Taking and rooting a cutting

1. Take a healthy stem segment 30 to 45 cm long from a mature plant. Longer cuttings establish faster and fruit sooner.
2. Cure it. Leave the cutting in a dry, shaded, airy place for five to seven days until the cut end has calloused over and looks dry and sealed. Skipping this step is the most common reason cuttings rot, and it is not optional.
3. Plant the calloused end 5 to 8 cm deep in free-draining cactus compost, the right way up — a cutting planted upside down will not root.
4. Do not water for the first week. Then water sparingly until you see new growth, which takes three to six weeks.
5. Once new stem segments appear, it has rooted and can be watered normally.

Building the support

The standard structure, used commercially and in gardens worldwide, is simple: a sturdy vertical post roughly 1.5 to 1.8 m tall, with a frame, ring or old tyre fixed at the top. The plant is trained straight up the post, and once it reaches the top it is allowed to flop over the frame and hang down.

That hanging habit is the whole point. Dragon fruit fruits on pendant stems, not on the vertical climb. A plant trained upward without ever being allowed to hang will grow vigorously for years and never flower.

Use a concrete post, a thick treated timber post or a metal pipe set firmly in the ground. A thin bamboo cane will fail under a mature plant. Tie the main stem loosely to the post as it grows, using soft ties, and remove any side branches below the top until the leader has reached the frame.

Climate and position

Dragon fruit wants full sun for most of the day, though in very hot desert climates some afternoon shade prevents the stems scorching yellow. It is a tropical and subtropical plant: it thrives between roughly 18 and 32°C, slows markedly below 10°C, and is damaged by frost. A light frost scars the stems; a hard one kills the plant.

In cooler climates it can be grown in a large container and moved into a greenhouse, conservatory or garage over winter. In a container, expect to use a pot of at least 40 to 60 litres for a mature plant.

Soil and watering

Drainage is the thing that matters. Dragon fruit is a cactus and root rot kills far more plants than drought does. Use a sandy, free-draining mix — cactus compost, or ordinary compost cut heavily with grit or perlite — with a slightly acidic to neutral pH of around 6 to 7. Never plant it in heavy clay without raising the bed or amending it thoroughly.

Water when the top few centimetres of soil have dried out, then water thoroughly and let it dry again. It is more drought-tolerant than it looks, but unlike a desert cactus it does need regular water during the growing and fruiting season. Cut watering right back in winter.

Flowering and pollination

The flowers are spectacular and strange: enormous, white, heavily perfumed, and they open for a single night before closing forever by morning. This is why the plant is called night-blooming cereus and moonflower.

The catch is pollination. Many dragon fruit cultivars are self-incompatible, meaning a flower will not set fruit with its own pollen. If you have one plant and it flowers beautifully and never fruits, this is almost certainly why. The solutions are to grow two different cultivars, to choose a known self-fertile variety, or to hand-pollinate.

Hand-pollination is easy and reliable. On the evening the flower opens, take a small soft brush, collect pollen from the anthers of one flower, and dab it onto the stigma of another. Do it at night or very early morning — by mid-morning the flower has closed and the opportunity is gone. Fruit ripens roughly 30 to 50 days after a successful pollination.

Timeline

• Weeks 1–6: cutting roots and begins new growth.
• Months 2–12: rapid vertical growth up the post. Keep tying it in and removing side shoots.
• Year 1–2: reaches the top of the frame and begins to branch and hang.
• Year 2–3: first flowers and first fruit, given enough sun and a mature hanging canopy.
• Year 4 onward: full production, potentially several harvests per season, for 20 years or more.