Moisture and Soil

• The halbard-leaved marshmallow occurs naturally in wet sites and marshes and is tolerant of poorly draining conditions, like those along water bodies. If an area does not stay fairly moist, the plant will require regular irrigation. This mallow can persist in water up to 2 feet deep and is suitable for ditches or basins that suffer from occasional flooding.
  
  

Light

• Hibiscus militaris prefers full-sun conditions and is especially well adapted to woodland and garden edges. If this plant does not receive adequate sunlight it may become floppy. Flowering, growth and shape will also suffer.
  
  

Range and Hardiness

• Depending upon the microclimate and site conditions, Hibiscus militarus can be grown from U.S. Department of Agriculture plant hardiness zones 4 through 10. This plant occurs naturally in wet sites from eastern Canada down to northern Florida and as far west as Texas.
  
  

Propagation

• This species can be propagated by seed, using cuttings or through root division. Seeds must be scarified before they can germinate. Carefully pierce the seed coat with a needle or rub the seed with a file or sandpaper to allow moisture to enter the seed.
  
  

Pests and Problems

• Hibiscus militaris may be troubled by Japanese beetles, aphids and weevils. Inadequate sunlight and water can impair plant growth and make a specimen more susceptible to infestations. This plant dies back following the onset of cold weather naturally, so cut it back to the ground following the year's first hard frost.