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Lavender companion · grow guide
Switch Grass · Panicum virgatum
Plant in full sun in almost any soil, from sand to clay, dry to moist. This tough native warm-season grass greens up late, colors in fall, and stands into winter.
Check my zone & planting dates
Full sunLight
Moderate waterAverage drainage
pH 5.0–8.0Soil
Zones 4a–9bHardiness
42″ tall24″ wide
ResistantDeer · rabbits resistant
Mildly toxicPets
Huckleberry saysTell me where you grow and I’ll check if Red Flame will thrive there.
Hardy in zones 4a–9b
Spring to early summer, once soil warms. Warm-season grasses root best in warm soil; avoid late-fall planting in cold zones.
Your year with Red Flame
When it arrives
Plugs arrive in active growth. Water the tray right away, set it in bright light out of harsh wind, and plant within a few days. If you wait, bump them into 3–4" pots. Harden off for a week before planting out, and keep the root ball moist the first 3–4 weeks.
Spring to early summer, once soil warms. Warm-season grasses root best in warm soil; avoid late-fall planting in cold zones.
Set the crown level with the soil; don't bury the base of the stems.
24–36" apart, by variety; compact types closer.
Adaptable: sand, loam or clay · pH 5.0–8.0
Fix-it tip: No amending needed in most soils. Don't add compost or fertilizer to rich soil; extra fertility makes tall types flop.
Full sun (tolerates light shade, with floppier stems).
6+ hours of sun keeps clumps upright and brings out red and blue leaf color. In shade, clumps open and lean.
Don’t give up on it
A warm-season grass: it wakes up late, often not showing new green blades until mid- to late spring, weeks after cool-season grasses. Don't dig it out—look for green at the base.
Cut back to 4–6"; be patient for late green-up.
Water young plants in drought; no feeding.
Enjoy fall color and seedheads.
Leave standing for structure and birds.
First season: Water weekly through the first summer while roots grow deep.
After that: Very drought tolerant once established, yet it also tolerates seasonally wet soil.
Not needed. Fertilizer tends to cause floppy stems.
Leave stems standing all winter. Cut to 4–6" in late winter or early spring, before new growth begins.
Every 4–5 years in spring if the center thins; mature clumps are dense, so use a sharp spade.
Very cold hardy. Foliage turns tan and holds seedheads that birds eat; stems give winter structure.
Thrives in heat and humidity. Many varieties turn red, burgundy or gold from late summer into fall.
Nothing green in MayLikely cause: Late warm-season emergence
What to do: Wait until late spring before assuming loss
Stems flop openLikely cause: Shade, rich soil or fertilizer
What to do: Give more sun; stop feeding
Dead center in an old clumpLikely cause: Crowding
What to do: Divide in spring and replant healthy edges
Orange-brown spots on leavesLikely cause: Rust
What to do: Improve air flow; cut back and remove debris in spring
Rolled, curling leaves on young plants mean too dry. Flopping usually means too much water, fertilizer or shade, not thirst.
Not listed by ASPCA. Switch grass has caused liver-related sun sensitivity in sheep, goats and horses grazing large amounts; no known risk to dogs or cats from nibbling.
Deer: resistant · Rabbits: resistant
Finnegan saysStill not sure what’s wrong? Ask Plant Health — describe it or add a photo.
Good in pots · 5 gallon+
Compact varieties work in large pots. Pots freeze harder than the ground; shelter them in zone 5 and colder.
Outdoor plant
Not suited to indoor growing.
Best after a cold winter
Perennial grass that goes dormant each winter; normal cold keeps it healthy.
Plugs from the tray
3–4 inch pots for 3–5 weeks, until roots hold the soil
Garden bed or a 5 gallon potTime to move up? Slide the plant out: if white roots wrap the outside of the soil, it’s ready for the next size.
Planting with lavender
Plant it right alongside lavender
Shares lavender's full sun, tolerance of lean soil and low water. Use it behind or between lavender rows for height, movement and fall color.
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