Growing a Mandarin from Seed
Growing a Mandarin from Seed explained for Australian readers, with local season, shopping, growing, recipe, nutrition, or industry context.
You can grow a mandarin from seed, but most seeds will not produce a tree that matches the parent fruit. Nearly all commercial and backyard mandarin varieties are hybrids. Seeds from hybrid trees produce variable offspring, sometimes with poor fruit quality or no fruit at all. Bunnings, Yates, and Ultimate Backyard all advise buying a grafted tree instead.
If you still want to try, this page covers the process honestly, including the realistic timeline.
Will mandarin seed grow true to type?
Almost certainly not, unless you are using Emperor mandarin seeds. Emperor is one of the few mandarin varieties that grows relatively true from seed. All other common varieties including Imperial, Honey Murcott, Afourer, and Satsuma are grafted hybrids and will not reproduce reliably from seed.
A seed-grown tree from a hybrid variety may produce fruit that is smaller, sourer, or seedier than the parent. It may also take much longer to fruit.
Realistic timeline
A grafted mandarin tree bought at a nursery should produce its first small crop within two to three years of planting.
A seed-grown tree takes five to ten years to produce fruit. Bunnings puts it plainly: “The resulting tree can take five to 10 years to produce fruit, and the tree may not bear fruit of the same quality as the original tree.”
Why grafted nursery trees are better
Grafted trees combine a productive fruiting variety (the scion) with a disease-resistant, well-adapted rootstock. The rootstock provides resistance to soil-borne diseases like Phytophthora root rot, tolerance to cold or wet soils, and consistency of tree size. A seed-grown tree has no rootstock advantage and starts from scratch without any of these benefits.
Grafted trees are available at Bunnings, Engall’s Nursery, Daley’s Fruit Trees, and most independent garden centres. A grafted dwarf Imperial at Engall’s in a 200mm pot costs around $55 and will outperform a seed-grown tree in nearly every respect.
If you still want to try
The best seed to use is Emperor mandarin. Collect seeds from ripe fruit, wash off the pulp, and plant fresh. Seeds stored for weeks or months have lower germination rates.
Step 1: Collect and prepare seeds
Wash seeds gently and dry on a paper towel. Plant in spring or early summer when soil temperatures are warm. Fresh seeds germinate better than stored ones.
Step 2: Sow in seed-raising mix
Fill a small 10 cm pot with seed-raising mix. Push one seed about 5 mm deep and cover. Water with a dilute seaweed solution after sowing.
Step 3: Provide warmth and moisture
Place the pot in a warm, bright spot out of direct sunlight. A mini greenhouse or a clear plastic bottle cloche over the pot maintains warmth and humidity. Keep the mix moist but not waterlogged. Germination takes around 7 to 10 days.
Step 4: Care for seedlings
When the seedling reaches 5 cm tall, start applying a diluted liquid fertiliser every 14 days during warmer months. Move pots into a sheltered sunny spot once the weather is consistently warm.
Step 5: Repot as the plant grows
When the seedling is 10 to 15 cm tall with a developed root system, repot into a 15 cm pot with premium potting mix. Continue repotting into progressively larger containers over two years.
Step 6: Plant in the garden
After two years, when the plant is around 30 cm tall, it can go into the garden. Choose a full-sun position with well-drained soil and plant so the base sits slightly above the surrounding soil level.
Step 7: Wait
Expect five to seven years before any fruit appears. Some seed-grown trees fruit sooner; many take longer.
Managing expectations
Protect seedlings from snails and slugs with iron-based bait. Aphids and caterpillars can attack young growth. Check leaves regularly.
A seed-grown tree makes a reasonable project or educational exercise. For reliable backyard fruit production, buy a grafted tree. The extra cost of a nursery tree is easily recouped in years saved waiting for fruit.