O'ahu doesn't have enough fresh water to keep every yard a lush oasis — especially in dry zones such as Hawai'i Kai and Kaimuki. And there's a less-wet way: xeriscaping. The Board of Water Supply sets a model example with its Halawa Xeriscape Garden (99-1268 Iwaena St., Halawa Central Industrial Park), which holds its annual open house from 9 a.m. to 3 p.m. today. The event includes workshops, classes, tours of the 3-acre garden, mulch giveaway (bring your own bags) and "unthirsty plant" sale.

Proceeds support education programs at the garden. Pick up some drought-tolerant and native Hawaiian plants to keep your water bill down and the water table up. Park on Iwaena Street, starting from Iwaiwa Street. Free shuttles will operate starting at 8:30 a.m.