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Plant care

Summit Sage (Supreme sage) care

Salvia summa

Also called Summit sage, Supreme sage, Great sage.

RHS H5USDA 6-9Pet-safeIndoor 25–35 cm tall and 30–45 cm wide

Watering rhythm

10-14days

Every 10–14 days

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Light

Bright indirect light (just back from a sunny window)

Soil

Calcareous, gritty, well-drained loam, pH 7.0–8.0

Humidity

Low to moderate (30–55 %)

Temp

-15–30 °C

Pet safety

Pet-safe

Mature size

25–35 cm tall and 30–45 cm wide

Care at a glance

Light

In the wild summit sage grows on the bright edge of a forest canopy, not in the canopy and not in the open. Indoors, that translates to within a metre of an unobstructed window, sheer curtain optional. In its native limestone cliff habitat it grows in partial shade; recreate this with dappled light or a few hours of gentle morning sun — harsh midday sun desiccates the small plants. The fastest test: a hand held at the leaf casts a soft-edged shadow at noon — sharp shadow means too much sun, no shadow means too little light.

Watering

Aim for every 10–14 days for summit sage, but treat that as a starting point rather than a rule. A south-facing summer windowsill will dry the pot twice as fast as a north-facing winter room. Lift the pot; if it feels noticeably lighter than it did wet, water it. Allow the soil to dry partially between waterings; the rocky, calcareous soils of its native cliffs provide sharp drainage, and prolonged wet conditions rapidly cause root rot.

Soil and pot

Summit Sage grows best in calcareous, gritty, well-drained loam, ph 7.0–8.0. Thrives in alkaline, limestone-based soils; incorporate lime chips or crushed limestone into the planting mix to replicate native conditions and ensure perfect drainage. A pot with a working drainage hole is non-negotiable for this species — even free-draining mix will turn soggy in a closed planter. If you love the look of a decorative pot without a hole, use it as a cachepot around an inner nursery pot you can lift out to water.

Humidity and temperature

Summit Sage sits happiest at around Low to moderate (30–55 %) humidity and -15–30 °C (5–86 °F). Adapted to the relatively dry mountain air of the Chihuahuan Desert borderlands; avoid humid, poorly ventilated spots that invite fungal leaf diseases. If you keep the room above year-round and avoid placing the plant near a cold draught, a hot radiator, or an air-conditioning vent, you have already handled the two biggest indoor stressors.

Fertilising

Feed summit sage sparingly. Feed very sparingly — one light application of low-nitrogen granular fertiliser in early spring is sufficient; this species is adapted to lean soils and over-feeding is counter-productive. Skip fertiliser entirely on a stressed, recently-repotted, or actively wilting plant — fertiliser salts make damage worse, not better. Wait for a round of healthy new growth before resuming a feeding rhythm.

Common problems

Below are the issues we see most often on summit sage in the Growli community. Each is annotated with the most common cause so you know where to start.

  • Root rot in heavy or wet soil — Its native limestone cliff habitat drains perfectly; any compacted or poorly drained garden soil will cause root rot — raised beds with gritty, alkaline compost are strongly recommended.
  • Slug and snail damage — The compact, low-growing habit makes young foliage and flowers vulnerable to slugs; use iron-phosphate pellets and gritty mulch around the crowns to deter molluscs.

Propagation

Seed sown in gritty, alkaline compost in autumn or early spring (cold stratification may improve germination); softwood cuttings can be taken in spring, though the small plant size limits cutting material. Propagation is the cheapest, most satisfying way to expand a collection — and it doubles as insurance against losing a mature plant to an accident. Take a backup cutting once the parent is established and healthy.

Toxicity to pets

Summit Sage is pet-safe. Salvia species are listed by the ASPCA as non-toxic to cats and dogs; mild gastrointestinal upset is possible if consumed in large quantities but no serious toxic effects are expected. If you keep cats, dogs, or curious children in the house, weigh placement carefully — a high shelf or a hanging planter is enough for casual safety. For severe ingestion incidents, call your local vet and the ASPCA Animal Poison Control Center (in the US, 888-426-4435).

Pet-safety status is sourced from the ASPCA Toxic and Non-Toxic Plant List, which catalogues the most-asked-about plants for cats, dogs, and horses.

Summit Sage care — frequently asked questions

What is the common name for Salvia summa?

Salvia summa is most commonly called Summit Sage, but it is also known as Summit sage, Supreme sage, Great sage. The names refer to the same species, so care instructions for Summit Sage apply identically to anything sold as Supreme sage.

How much light does summit sage need?

Summit Sage grows best in bright indirect light (just back from a sunny window). In its native limestone cliff habitat it grows in partial shade; recreate this with dappled light or a few hours of gentle morning sun — harsh midday sun desiccates the small plants.

How often should I water summit sage?

Water summit sage every 10–14 days. Allow the soil to dry partially between waterings; the rocky, calcareous soils of its native cliffs provide sharp drainage, and prolonged wet conditions rapidly cause root rot. The finger-test (or lifting the pot to feel its weight) beats a fixed weekly calendar because pot size, light, and season all change how fast the soil dries.

Is summit sage toxic to cats and dogs?

Summit Sage is pet-safe. Salvia species are listed by the ASPCA as non-toxic to cats and dogs; mild gastrointestinal upset is possible if consumed in large quantities but no serious toxic effects are expected.

What USDA hardiness zone does summit sage grow in?

Summit Sage is rated for USDA zone 6-9 and RHS hardiness H5. Outside that range, grow it as a container plant that overwinters indoors before the first hard frost.

Summit Sage deep-dive guides

Every aspect of summit sage care, each with its own calibrated guide:

Featured in these plant shortlists

Summit Sage qualifies for 10 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

Related guides

Summit Sage is also known as Summit sage, Supreme sage, and Great sage.