How to Care for a Corkscrew Grass Marshland Plant

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Corkscrew grass, known botanically as Juncus effusus spiralis, is a perennial wetland plant prized for its exotic-looking, curling form. Corkscrew grass grows best on the edges of marshes, ponds and water gardens where the soil is frequently flooded; it can also be grown indoors as a houseplant. Grow corkscrew grass outdoors in U.S. Department of Agriculture Plant Hardiness Zones 4 through 10.

Things You'll Need

  • Balanced fertilizer
  • Pruning shears

Keep the soil moist at all times. It is usually not necessary to water corkscrew grass that is growing on the edges of marshes or ponds. Water container-grown corkscrew grass as frequently as necessary to maintain moist soil.

Fertilize container-grown corkscrew grass once a month with a half-strength solution of a balanced, water-soluble fertilizer used according to label directions. It is not necessary to fertilize marshland or pond corkscrew grass unless an agricultural extension office soil analysis report specifically calls for it.

Cut marshland or pond corkscrew grass to the ground in the winter to promote vigorous growth the following growing season. This is only necessary if you live in a warm climate; elsewhere corkscrew grass will freeze and die back on its own. Trim container-grown corkscrew grass as needed, to control its size and shape, or to encourage branching.

Tips & Warnings

  • The spread of corkscrew grass is quite vigorous. If you're planting corkscrew grass in a pond or water garden, plant the grass in a submersible container to control its spread.
  • Allowing the soil that your corkscrew grass is planted in to dry out can quickly kill the roots of your plant.

References

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