Starting a tree nursery at Nanga primary school

Samuel and Oscar from the Moshi indigenous tree nursery teaching 5th and 6th graders at Nanga primary school how to establish a tree nursery. How to collect seeds? How to treat seeds, sowing fresh, soaking in hot or cold water, how long? How to mix a good nursery soil? How to cut polythen bags from the roll? How to fill them? How many seeds to sow per bag? When do they germinate? Where to get information on species (there are tree books)? How often to water, how much? Shade or sun?