I built a few of these last summer. they work fantastically!
Sub-irrigated Planters
Sub-irrigated planters are simple devices that allow low-maintenance, low-water consumption container gardening. Appropedia has DIY-instructions, using plastic buckets or bottles.
Via nestfullofeggs:
reuse toilet paper tubes for seedlings
This is post 1 of 2 of Unconsumption-y garden-related ideas. Post #2 follows.
(via craftacular)