My experience: Use valves that are suitable for low flow/pressure and work off 24 VAC so you can use them with a cheap line-powered electronic timer. If you n

My experience: Use valves that are suitable for low flow/pressure and work off 24 VAC so you can use them with a cheap line-powered electronic timer. If you need to filter or pressure regulate before the valves (probably at least filtering), be sure to use parts rated for continuous pressure at above typical household pressure. (100 psi ratings are probably enough) Minimize the types of different tubing and emitters you use, it's easier to have spares that way, so if you weed with sharp implements and cut something it's not too annoying. Don't go significant distances with less than the 1/2" black polyethylene tubing. Drip-tape is super-cheap but mostly for farm-scale row crops. The emitters I've had the best experiences with are the Netafim Woodpecker emitters and the take-apart-to-clean-out "flag" drippers sold by dripworks.com