Germination time: 15-20 Days For germination temperature: 10-25 Celsius. Planting instructions: Anyone who wants to grow a garden or just grow plants in pots should learn how to plant seeds using a seed tray. It does not require much money or time in order to plant seeds. You do not even need a green thumb in order to prepare seedlings and be able to transfer them to your pots or your garden. Our following little guide will show you how to plant seeds using a basic seed tray. Materials Required The materials required to plant seeds are: soil seeds seed tray water You can buy the basic tray minus any frills to get things started. In fact, any flat plain seed tray will work just fine. The only thing you need is to know how to plant the seeds correctly.