Troubleshooting
Spike Moss problems — and how to fix them
Spike Moss (Selaginella kraussiana) 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.
Brown, shrivelled or crispy foliage
Almost always caused by low humidity or the soil drying out. Raise humidity to 70%+ (a terrarium, humidifier, or pebble tray) and keep the mix constantly damp.
Yellowing or scorched leaves
Too much light or direct sun bleaches and burns the delicate foliage. Move to bright indirect light or partial/deep shade.
Root rot and mushy stems
Result from waterlogged, poorly drained soil with standing water. Keep soil moist but never soggy and ensure the pot drains freely.
Brown leaf tips
Often from over-fertilising or mineral build-up. Dilute feed to half strength, feed sparingly, and water with rain or distilled water.
Spider mites and mealybugs
Sap-sucking pests can hide among the dense foliage, especially in drier air. Maintaining high humidity deters them; treat with a mild insecticidal soap if they appear.
Sudden collapse after drying out
Unlike some plants, spike moss will not survive prolonged drought; even one missed watering can be fatal. Never let it dry out completely.
Prevent spike moss problems before they start
Most spike moss issues are care-mismatch, not bad luck. Dial in the basics:
Spike Moss problems — FAQ
Why is my spike moss brown, shrivelled or crispy foliage?
Almost always caused by low humidity or the soil drying out. Raise humidity to 70%+ (a terrarium, humidifier, or pebble tray) and keep the mix constantly damp.
Why is my spike moss yellowing or scorched leaves?
Too much light or direct sun bleaches and burns the delicate foliage. Move to bright indirect light or partial/deep shade.
Why is my spike moss root rot and mushy stems?
Result from waterlogged, poorly drained soil with standing water. Keep soil moist but never soggy and ensure the pot drains freely.
Why is my spike moss brown leaf tips?
Often from over-fertilising or mineral build-up. Dilute feed to half strength, feed sparingly, and water with rain or distilled water.
Why is my spike moss spider mites and mealybugs?
Sap-sucking pests can hide among the dense foliage, especially in drier air. Maintaining high humidity deters them; treat with a mild insecticidal soap if they appear.
Why is my spike moss sudden collapse after drying out?
Unlike some plants, spike moss will not survive prolonged drought; even one missed watering can be fatal. Never let it dry out completely.