Grow and Care for Corkscrew Rush

Grow rush in full sun with the moisture that matches the plant you bought. The tag may also say Juncus. Corkscrew forms need soil that stays wet; California gray rush can take a rain garden that dries in summer.

Keep corkscrew rush wet, and site gray rush in a rain garden

Rush fails fastest when the water does not match the plant. Corkscrew and common rush want soil that never dries, and they can sit with about 1 to 6 inches of water over the crown. [1] California gray rush takes that same wet winter, then handles a summer-dry rain garden — it does not need a pond. [2] Full sun keeps the stems upright. Deep shade thins the clump.

1. Site the plant in full sun. Light shade is a fallback, not the first choice.
2. Keep corkscrew and common rush wet. Use a pond edge, a bog, or a pot that never dries.
3. Site California gray rush in a rain garden or other ground that swings from winter wet to summer dry. Water it in the first summer; after that it can take dry spells.
4. Do not plant rush in deep shade, and do not put a corkscrew clump in a bed that dries hard in August.

Pair it with other wet-edge plants

Pair wet corkscrew clumps with other pond-margin plants that share the same water. Pair gray rush with rain-garden plants that can dry down in summer. Keep aggressive spreaders in their own pots so the edge stays tidy.

Plant at the same depth as the pot, and sink a pot to stop the spread

Plant at the same depth the rush grew in the nursery pot. For a pond edge, a group of several clumps reads better than one thin stem. Rhizomes and seed can push into the margin. Sink the pot with the rim above the soil, or grow the plant in a container on paving, if you need a hard stop. [3] Pull volunteers. A 2-gallon pot or larger holds a patio clump more steadily than a tiny cup.

1. Water the nursery pot, then slide the root ball out.
2. Dig a hole no deeper than the pot. Set the crown at the same depth it grew in the container.
3. Backfill and water so the mix stays wet around corkscrew and common rush.
4. If spread must stop, sink the pot with the rim proud of the soil, or keep the plant in a container.
5. Deadhead spent clusters, or pull seedlings, if you want a tidy edge.

Grow corkscrew rush indoors in a pot that never dries

Corkscrew rush is a fair houseplant when the mix stays evenly wet and the light is bright. Do not let the pot go dust-dry — stems yellow, then brown. A saucer of water under the pot is fine. Move a patio pot indoors before a hard freeze if you want green stems through winter.

Divide a crowded clump in spring

When the pot is packed, or the center thins, lift the clump in spring. Split the rhizomes so each piece has stems and roots, and replant at the same depth in wet mix. Do not count on seed if you bought a corkscrew form — seedlings often grow straight.

Cut browned stems in early spring

In a cold winter the stems yellow, then brown, then die back. Cut that thatch in early spring before new growth pushes. In a mild winter the clump may stay green; comb out dead stems and skip a hard cut. Indoor plants in a bright room often stay green and need only light grooming.

1. Wait until late winter or early spring, after the worst cold has passed.
2. Cut browned outdoor stems close to the crown.
3. Leave a green clump uncut except for dead stems.

Not a grass, not a sedge, and not papyrus

Rush is in its own family. The stems are round and solid, without the joints of a grass. [4] Sedges such as Carex have triangular stems you can feel when you roll them. Papyrus is Cyperus, a different wet plant with umbrella sprays. Cattail is Typha, with flat blades and a sausage spike. Bottlebrush is a woody shrub with red spikes — the name collides with “brush,” not with this plant. The search “juncus grass” is a nickname. Grow this as a rush.

Corkscrew rush, California gray rush, or hard rush

Sun is shared. Water is not. Read the tag before you mix three clumps in one basin.

J. effusus is common rush, also sold as soft rush. Corkscrew selections on this line want wet soil or shallow water and stay about 12 to 18 inches in a tangled clump. J. patens is California gray rush — stiff gray-green stems about 2 feet tall that take a rain garden and summer-dry spells. J. inflexus is hard rush, an upright blue-green clump to about 3 feet; keep it moist, and do not treat it as a dry border grass.

Match the rush to moisture, sink a pot if spread must stop, keep an indoor corkscrew wet, and cut browned stems in early spring.