1. Ovule polyembryony: The seeds of some plants have polyembryony, that is, one seed contains multiple ovules. When such seeds germinate, each ovule will develop into a seedling, so there will be multiple seedlings growing at the same time.
2. Embryo translocation: In some cases, the embryo in litchi seeds may undergo embryo translocation, that is, the embryo divides and differentiates into multiple independent embryo seats during development. When seeds germinate, each embryo seat will develop into a seedling, which will also lead to the simultaneous growth of multiple seedlings.
The above information is for reference only, and you can consult a botanist for more accurate information.