last year I setup a drip system on timer for my maples. 1 GPH dripper on 1 gallon pots. Watering 15-20 minutes. I did not particularly like the spaghetti like arrangement, (1 tubing per 7 small plants, 7 drippers) but it did the job of keeping the pot moist in the middle of summer. I am thinking of trying something new, maybe get the 1/2" soft tubing (or maybe hard PVC pipe) and poking holes in them, running them along the top of containers. Has anyone tried this?