Something like this?

(I have no experience ordering from this vendor)

Here is a link that might be useful: Tree cell - cone-tainer

Although this is what is used in commercial tree growing from seed, for your school project they are not necessary. Without the rack to keep them standing upright they will be a nuisance. The tubes are designed to automatically root prune the tap root at the desired length. Al

Right, I wasn't trying to give an endorsement of the product, only suggest where available.

Depending on the age of the child/student, I would caution using oak for a classroom project at all unless the attention span of the children could match the germination requirements - which are approx 4 to as long as 12 months and following a period of moist cold conditions (depending on which oak). It could be boring to a less sophisticated class :)

Thanks that is exactly what i was looking for. Its for an outdoor club for the kids to try growing nut trees to plant. A little trial and error will be involved but this is one method we will try. Thanks for the help!!