My husband has just built me a box that is 8 ft by 2 ft and 2 ft deep to grow blueberries in. Can I get 3 plants in that or is it only big enough for two? I've been reading old posts and it seems Sweetcrisp should grow in my zone (7A central Oklahoma) -- will they cross-pollinate or do I have to have one of something else?

I will be building my own soil for the box. I usually use Mel's Mix from Sq Ft Gardening - 1/3 vermiculite, 1/3 spaghnum peat, and 1/3 compost. But that has a pH of about 7. Should I go to 1/2 peat or more? I have lots of pine needles, or for that matter a dried up pine tree I could run through my chipper and mix into the soil. I will mulch with the needles for sure. I will also have access to oak leaves in the fall. I have very alkaline water so I hope I can get lots of rain water.

Can I plant this fall or should I wait until spring?