Blue sage

Year-round

Mountain blue sage is a silvery-leaved evergreen shrub from dry, high-elevation slopes in California, Nevada, and Arizona. It is not documented as native to Texas, but its preference for lean, alkaline, fast-draining soil lines up well with El Paso's ground, even though El Paso sits at a much lower, hotter elevation than its wild habitat.

• Plant in full sun to light afternoon shade in soil that drains fast. Calscape lists it as adapted to nutrient-poor, alkaline soil, a good match for El Paso's caliche.
• Water sparingly. This is a low-water shrub once established, and overwatering in heavy or slow-draining soil is more likely to kill it than underwatering.
• Its documented elevation range is 5,000 to 10,000 feet, well above El Paso's roughly 3,700 feet. Expect it to grow in a hotter, lower environment than it experiences in the wild.
• Give it excellent drainage, a raised bed or a slope works well, since low desert humidity paired with poor drainage is the main way this species fails.

Its tidy, silvery mounded shape and long summer bloom make it an HOA-friendly foundation shrub for a front xeriscape bed.

Fall

Fall is when mountain blue sage's flower show tends to wind down, and cooling El Paso temperatures are a natural cue to start reducing water further.

• Taper watering to once a month or less as blooms fade and temperatures drop.
• Leave spent flower spikes with their wine-red bracts in place. They add fall and winter interest and are part of this plant's appeal.
• This is a low-risk window to do minor shaping, since the plant is heading into dormancy rather than active growth.
• Skip mulch heavy in organic matter. Keep the base area lean and well drained heading into winter.

Winter

As an evergreen shrub from cold mountain habitat, mountain blue sage is built to handle winter cold, and El Paso's freezes should generally fall within its tolerance once it is established.

• Stop supplemental watering almost entirely in winter unless the season is unusually dry, since wet cold soil is more damaging than the cold itself.
• No winter protection is typically needed for an established plant, since its wild habitat regularly sees snow and freezing temperatures at elevation.
• If a hard freeze damages foliage, wait until spring growth resumes before pruning out dead wood, since winter pruning can expose live wood to further cold.
• Check drainage after any winter rain or rare snow. Standing water at the base in cold weather is the most common way this shrub is lost.

Spring

Spring is a good time to plant mountain blue sage in El Paso, letting its roots establish in fast-draining soil before summer heat and the plant's natural bloom season arrive.

• Plant after the last frost, typically mid-April in El Paso, into a hole no deeper than the root ball with no added compost, since rich soil holds too much moisture for this species.
• Water twice a week for the first month to establish roots, then cut back sharply.
• Hold off on fertilizer entirely. This species is adapted to nutrient-poor soil and fertilizing can cause weak, floppy growth.
• Spring wind and dust are common here. Stake young plants loosely for the first season if they are in an exposed spot.

Summer

Summer brings this shrub's main bloom period, with violet-blue flower spikes forming even as El Paso's heat and low humidity intensify.

• Once established, water only every 2 to 3 weeks during summer. This species is more likely to suffer from too much water than too little.
• Expect the strongest bloom show from around July into September, per its documented flowering window.
• Skip afternoon overhead watering entirely. Wet foliage combined with high heat encourages fungal problems on this species.
• Light, careful shaping after the first bloom flush can encourage a second round of flower spikes later in summer.