Most longan trees have been grown from seed. The seeds lose viability quickly. After drying in the shade for 4 day, they should be planted without delay, but no more than 3/4 in (2 cm) deep, otherwise they may send up more than one sprout. Germination takes place within a week or 10 days.

Are longan true to seed?

The longan tree (Dimocarpus longan) is in the same botanical family as the lychee tree and can grow to 40 feet. ... It is rather difficult to grow longan from seed, so propagating it by air layering, also known as marcottage, works best.

Are longan seeds poisonous?

Remove the seed

Some seeds contain cyanide that is poisonous and fatal. Longan seeds, however, contain saponin that causes irritation in the dog's stomach and ultimately leads to diarrhea. Apart from that, logan seeds, like logan shells, pose a risk of choking your dog or of causing intestinal obstruction or blockage.