Troubleshooting
Catmint 'Walker's Low' problems — and how to fix them
Catmint 'Walker's Low' (Nepeta x faassenii) is generally forgiving once you match its basics, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Powdery mildew
Occurs in humid, poorly ventilated conditions or after midsummer. Improve air circulation, avoid wetting foliage, and cut plants back hard after the first flowering flush to promote clean new growth.
Floppy stems
Rich soil or insufficient light causes lax, sprawling growth. Grow in full sun with lean soil, or use a grow-through support ring. Cutting back by one-third after first bloom also stiffens regrowth.
Crown rot
Caused by waterlogged or poorly drained soil, especially over winter. Plant on a slight slope or in raised beds with gritty soil to ensure drainage.
Aphids
Young shoot tips may attract aphids in spring. Knock off with a strong water jet or apply insecticidal soap; plants usually outgrow minor infestations.
Cat damage
Cats roll in and chew the foliage due to nepetalactone. Protect young plants with wire cloches until established; mature plants recover well from occasional disturbance.
Prevent catmint 'walker's low' problems before they start
Most catmint 'walker's low' issues are care-mismatch, not bad luck. Dial in the basics:
Catmint 'Walker's Low' problems — FAQ
Why is my catmint 'walker's low' powdery mildew?
Occurs in humid, poorly ventilated conditions or after midsummer. Improve air circulation, avoid wetting foliage, and cut plants back hard after the first flowering flush to promote clean new growth.
Why is my catmint 'walker's low' floppy stems?
Rich soil or insufficient light causes lax, sprawling growth. Grow in full sun with lean soil, or use a grow-through support ring. Cutting back by one-third after first bloom also stiffens regrowth.
Why is my catmint 'walker's low' crown rot?
Caused by waterlogged or poorly drained soil, especially over winter. Plant on a slight slope or in raised beds with gritty soil to ensure drainage.
Why is my catmint 'walker's low' aphids?
Young shoot tips may attract aphids in spring. Knock off with a strong water jet or apply insecticidal soap; plants usually outgrow minor infestations.
Why is my catmint 'walker's low' cat damage?
Cats roll in and chew the foliage due to nepetalactone. Protect young plants with wire cloches until established; mature plants recover well from occasional disturbance.