Purple muhly

Year-round

Purple muhly is a bunching ornamental grass that puts on a dark purple to tan seed plume from September through November. It comes from dry, rocky high country in West Texas, New Mexico and Arizona, not from North Texas itself, so the main job here is giving it sharp drainage rather than extra feeding or water.

• Plant in full sun, at least 6 hours of direct light a day. It will flop over and bloom weakly in shade.
• It is not native to North Texas (its native range is West Texas, New Mexico and Arizona), so treat excellent drainage as the top priority instead of fertilizer or extra irrigation.
• In heavy black clay, plant it high on a slight mound or work expanded shale or coarse sand into the hole so roots do not sit in wet clay; in the sandier soils west of the metro it drains on its own but will need water more often through its first summer.
• Space clumps 18 to 24 inches apart. A mature clump reaches 2 to 3 feet tall and about as wide.
• Skip fertilizer. Rich soil makes the clump floppy and mutes the purple seed color.

Summer

Once established, purple muhly is one of the more heat and drought tolerant grasses for a North Texas front yard. From June through August it needs little from you besides letting it dry out between waterings.

• An established clump (planted a full growing season or more ago) only needs a deep watering every 2 to 3 weeks during the 100F stretch. Watering more often makes it grow floppy and pale instead of upright.
• A clump planted this spring is not established yet and still needs a deep soak about once a week during the hottest weeks.
• Keep mulch and soil off the crown itself; a thin layer of gravel mulch around the base suits it better than a thick bark mulch piled against the stems.
• Skip fertilizer through summer. Feeding a heat stressed grass encourages weak growth at the worst time.

Fall

Fall is purple muhly's showiest season. The seed plumes turn a rich dark purple starting in September and fade to a soft tan by November, its best-looking stretch in a North Texas yard.

• Let the seed plumes stand once they appear in September. Do not cut them back, this is the peak ornamental display.
• Fall is also a good time to divide an overcrowded clump, from October into November, while it is cool but before the mid November average first freeze.
• Cut back supplemental watering as temperatures drop. An established clump needs little to no extra water once fall rain arrives.
• The purple color is most vivid in the first two to three weeks after the plumes emerge in September, then it fades toward tan through November.

The purple to tan seed plumes read as an intentional ornamental grass display rather than a weed gone to seed, especially if the clump stays inside its bed edge.

Winter

Purple muhly goes dormant and tan through winter. The main task is one clean cutback before spring growth starts, not ongoing care.

• Leave the dried tan foliage and seed heads standing through winter. They add texture and give the crown some cold protection.
• Wait until late winter to early spring, once hard freezes have mostly passed, then cut the whole clump back to about 6 inches above the ground. Cutting too early raises the risk of freeze damage to the crown.
• Keep mulch off the crown itself during winter, a thin gravel layer around (not on top of) the base is enough.
• Do not water during dormancy unless the soil has been dry for several weeks with no rain. During a hard Arctic freeze, a newly planted (first year) clump benefits from a loose layer of mulch pulled up around, not on top of, the crown.

A clump left standing through winter and cut cleanly before spring keeps it reading as a maintained bed feature rather than neglected grass.

Spring

Spring is the right time to plant purple muhly in North Texas. It is a warm season grass that greens up and starts actively growing as the soil warms.

• Plant potted purple muhly from March through May, after the mid March average last frost, so roots get established before the July heat arrives.
• Water a new planting two to three times a week for the first six weeks, then taper off as roots take hold.
• In heavy black clay, dig the hole about twice as wide as the pot and set the crown slightly above grade so water drains away from it; in the sandier soils west of the metro, water a bit more often since it drains faster.
• If you did not cut back dried winter foliage already, do it now, down to 4 to 6 inches, before new blades emerge.
• Do not fertilize at planting. This grass prefers low fertility soil and does not need feeding to establish.

A freshly cut, low clump going into spring reads as a planned bed feature, not overgrown grass.

Year-round

Purple muhly is a bunching ornamental grass that puts on a dark purple to tan seed plume from September through November. It comes from dry, rocky high country in West Texas, New Mexico and Arizona, not from North Texas itself, so the main job here is giving it sharp drainage rather than extra feeding or water.

• Plant in full sun, at least 6 hours of direct light a day. It will flop over and bloom weakly in shade.
• It is not native to North Texas (its native range is West Texas, New Mexico and Arizona), so treat excellent drainage as the top priority instead of fertilizer or extra irrigation.
• In heavy black clay, plant it high on a slight mound or work expanded shale or coarse sand into the hole so roots do not sit in wet clay; in the sandier soils west of the metro it drains on its own but will need water more often through its first summer.
• Space clumps 18 to 24 inches apart. A mature clump reaches 2 to 3 feet tall and about as wide.
• Skip fertilizer. Rich soil makes the clump floppy and mutes the purple seed color.

Summer

Once established, purple muhly is one of the more heat and drought tolerant grasses for a North Texas front yard. From June through August it needs little from you besides letting it dry out between waterings.

• An established clump (planted a full growing season or more ago) only needs a deep watering every 2 to 3 weeks during the 100F stretch. Watering more often makes it grow floppy and pale instead of upright.
• A clump planted this spring is not established yet and still needs a deep soak about once a week during the hottest weeks.
• Keep mulch and soil off the crown itself; a thin layer of gravel mulch around the base suits it better than a thick bark mulch piled against the stems.
• Skip fertilizer through summer. Feeding a heat stressed grass encourages weak growth at the worst time.

Fall

Fall is purple muhly's showiest season. The seed plumes turn a rich dark purple starting in September and fade to a soft tan by November, its best-looking stretch in a North Texas yard.

• Let the seed plumes stand once they appear in September. Do not cut them back, this is the peak ornamental display.
• Fall is also a good time to divide an overcrowded clump, from October into November, while it is cool but before the mid November average first freeze.
• Cut back supplemental watering as temperatures drop. An established clump needs little to no extra water once fall rain arrives.
• The purple color is most vivid in the first two to three weeks after the plumes emerge in September, then it fades toward tan through November.

The purple to tan seed plumes read as an intentional ornamental grass display rather than a weed gone to seed, especially if the clump stays inside its bed edge.

Winter

Purple muhly goes dormant and tan through winter. The main task is one clean cutback before spring growth starts, not ongoing care.

• Leave the dried tan foliage and seed heads standing through winter. They add texture and give the crown some cold protection.
• Wait until late winter to early spring, once hard freezes have mostly passed, then cut the whole clump back to about 6 inches above the ground. Cutting too early raises the risk of freeze damage to the crown.
• Keep mulch off the crown itself during winter, a thin gravel layer around (not on top of) the base is enough.
• Do not water during dormancy unless the soil has been dry for several weeks with no rain. During a hard Arctic freeze, a newly planted (first year) clump benefits from a loose layer of mulch pulled up around, not on top of, the crown.

A clump left standing through winter and cut cleanly before spring keeps it reading as a maintained bed feature rather than neglected grass.

Spring

Spring is the right time to plant purple muhly in North Texas. It is a warm season grass that greens up and starts actively growing as the soil warms.

• Plant potted purple muhly from March through May, after the mid March average last frost, so roots get established before the July heat arrives.
• Water a new planting two to three times a week for the first six weeks, then taper off as roots take hold.
• In heavy black clay, dig the hole about twice as wide as the pot and set the crown slightly above grade so water drains away from it; in the sandier soils west of the metro, water a bit more often since it drains faster.
• If you did not cut back dried winter foliage already, do it now, down to 4 to 6 inches, before new blades emerge.
• Do not fertilize at planting. This grass prefers low fertility soil and does not need feeding to establish.

A freshly cut, low clump going into spring reads as a planned bed feature, not overgrown grass.