Post-Freeze Care for Foxtail Ferns and Mystery Grasses

Assessing Cold Damage

After a hard Houston freeze, foxtail ferns are dry and yellow; waist-high grasses (possibly Japanese iris) need pruning guidance. The owner asks whether to cut back and how much to leave.

General Rule for Cold-Damaged Perennials

Wait and be patient. Dieback is often only surface-level. New growth typically emerges from the roots weeks into spring—sometimes a month or more after the last frost.

What to Do Now

• Prune off all dead, brown material for aesthetics.
• Do not dig up or assume death until warm weather persists.
• Water sparingly until new shoots appear.

Identifying the Grasses

"Japanese iris" is likely a misnomer. True Japanese iris (Iris ensata) is a flowering perennial, not a grass. The description suggests a ornamental grass like Miscanthus or Pampas. Cut back to 6–12 inches in late winter before new growth starts.