Gaps in my Garden Knowledge

• Planting distance: How far apart do you really need to plant things? (I tend to ignore the directions on the packet and plant much closer together)
  
• Mulch: What is it really? What's the best kind?
• Seedling mix recipe (I've heard peat moss is bad for environment--draining bogs and wetlands--and also too acidic)
• What is pH really? (create a key /cheat sheet for identifying pH and adjusting soil pH)
• Worm compost vs. hot compost
• How to be more water-wise and ecologically conscientious in growing food (I think the Indians in SF at acorns. Would that be the real "macrobiotic" thing to eat --what's native to this area? What does it mean to have altered the landscape)
• Future gardens: Native plants, xeriscaping