Fertilizing Cactus Seedlings: When and How Much

Johnson's cactus seedlings burned from early fertilizing. He had 1-7-6 feed with biweekly instructions.

Safe Protocol

Wait until the two seed leaves (cotyledons) disappear.
Then fertilize at ½ strength, monthly or less.
Better growth from grow lights, longer days, higher humidity—not fertilizer.
Never overwater—rot risk.

Time-release fertilizer in soil may suffice.

Cactus: Feeding Cactus Seedlings: Wait Until Established, Then Go Light; Creating a Successful Cactus Terrarium: Expert Tips for Open-Container Design; Christmas Cactus Aerial Roots & Fertilization Schedule: Epiphyte Care Decoded; Growing Cactus Seedlings: Light, Color Changes, and Survival; UK Winter Rescue for Frozen Mexican Columnar Cacti; Heliotropism in Prickly Pear: Universal Cactus Behavior; Are There Native Cacti in Madagascar?; Scabby Cacti: Reader Rates Expert Poorly, Greg Responds; Inside a Cactus: How They Survive Without Water; Why Choose Cowpots for Seed Starting: Biodegradable, Root-Friendly, Eco-Smart

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