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Last fall I direct seeded English oak acorns into two fence rows using the Blue-X direct-seeder tubes. Dropped two acorns per tube and then a fistful of potting soil on top. About half (of 32 tubes) germinated and are now growing a strong seedling.
I used the same procedure to direct seed into my nursery area 12 EngOak acorns. Every one of them produced a strong seedling.
As some sort of 'control' I planted a dozen EngOaks into the nursery without the Blue-X tubes.....they germinated 100% and are growing strong and straight --results were similar to the tube grown nursery seedlings.
I also used Blue-X direct-seed tubes for American plum seeds that I stratified over the winter. Their germination rate was very near 100% and these seedlings growing within tubes are much stronger and taller than those plum seedlings growing without a tube.
Without straying too far off-topic: Let me suggest you investigate English Oaks for acorn production. The amount of acorns ---big acorns!----that one of these mature trees produce is mind-boggling. Much greater than any native oak I've ever witnessed. They are susceptible to mildew problems, but still, if you plant enough of them in the right area you can get a carpet of big acorns on the ground.
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The heck with it...let's "stray"
Check this English Oak strain for mildew immunity:
English Oak — Quercus robur
or check several hybrid english oak crosses which are stronger, faster growing trees:
Hybrid Oaks
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Oikos Trees has some quality seedlings. I have bought some of the hybrid chestnuts from them and will be buying some of the hybrid oaks also. Good company to purchase from.