This half width seed starter kit 15 cm (6″) wide by 53 cm (21″) long fits nicely on many windowsills and shelves. This kit comes with waterproof tray, humidity dome and 16 plantable biodegradable pots. Ideal for growing those plants from seed that do not transplant well as you simply plant the entire container – the end result is very little transplant stress!. . 1 kit $5.99.