The large evergreens here take advantage of our mild wet winters as they are able to utilize the moisture then for growth while keeping their ‘options’ open for the infrequent summer showers we get. Our native deciduous grasses are early growers mostly going dormant later in summer as our seasonal drought settles in. The Bouteloua gracilis ‘Blonde Ambition’ comes from the prairies states and benefits from some supplemental summer water to help them avoid stress and premature die back. The Onions, as bulbs, tend to have a dormant summer period. When mixing plants with different water requirements you must be sure to keep them from varying too widely.