Roof deck: watering fruit trees in summer
I've got some fruit trees on my roof deck that need help. After reading Tapla's soil post, I would like to repot into better soil (gritty mix or 5-1-1 maybe?). However, watering is a big challenge, as there is no tap up there. The soil is drying out really quickly this summer. I would like to move my semi-dwarf peach and cherry trees and dwarf nectarine and apple trees into 20-gallon cloth pots, incorporate coconut husk chips and sphagnum moss into the soil, and use kenaf liners to help absorb and slowly release moisture into the soil. I also bought some PlantMinder water bulbs. You see, I will be taking some vacations this summer, and I worry that the soil will dry up completely when I go. Hopefully I can set up a rainbarrel and drip irrigation system in August, but I'm not sure that I can (I rent, so probably shouldn't cut the gutters to use a downspout diverter; I don't think any of my faucets are hose-adapter compatible). Is there anyone out there with a similar situation? Has anyone used the products I mentioned (fabric pots, PlantMinder water bulbs, kenaf liners, coconut husk chips)? Any and all advice and shared experiences would be greatly appreciated.