Why Upside-Down Fern (Arachniodes standishii) Won't Spread in Zone 6

A gardener in northern NJ (zone 6) has grown Arachniodes standishii for years: one plant survived, but it hasn't increased in size or produced spores. Seeking the "trick" to multiplication.

Key Facts

• Propagation difficulty: Casa Flora (US propagator) notes it's "reluctant to produce spores and then reluctant to drop them"—hence tissue culture production.
• Spore propagation likely impossible for home gardeners due to selection history.
• Hardiness: Rated to zone 6—you're at the cold edge. Extreme winters may set it back.
• Growth habit: Clumping, slow. Division is the only viable propagation method.
• Stress induction (heat/cold/drought) might trigger fertile fronds, but not reliable in garden settings.

Realistic Expectations

No documented "tricks" exist. Wait for clump to enlarge sufficiently for division (years). Ensure winter protection (mulch, wind break). Accept it as a slow, rare specimen rather than a spreader.