ID them fast by size and roots:
- Duckweed: 1-8mm, one tiny rootlet, near-impossible to remove
- Salvinia: bristly oval leaves, no roots, lifts in sheets
- Frogbit: round leaves, long trailing roots, easy to corral
The fix is a number, not a vibe. Hold floating coverage at 25 to 50%, thin to the floor weekly (twice for duckweed), and check under-mat light with a meter. Keep heavy mats for fry and low-light tanks, strip them off high-light carpets.
Your June floating plants aren't decor anymore. They're a green ceiling. Duckweed is the fastest-growing flowering plant on Earth, doubling in as little as 1.34 days. Here's why floaters explode in summer and how to stop the shade-out crash.
The crash mechanism: a thick floating mat intercepts light at the surface and cuts what reaches your substrate by 50 to 70%. Once bottom light drops below your carpet plant's compensation point, it slowly starves. The melt shows up weeks after the mat thickened.
You sprayed the whole caudex, the white cotton vanished, and two weeks later mealybugs are back in the same fold. That's not bad luck. It's physics. Here's why every spray misses them.
What actually works: a systemic drench reaches hidden colonies (but kills under 50% alone, so pair it), oil surfactant brushed into folds, and 70% alcohol on visible clusters. Root mealybugs? Bare-root and heat-soak.
Your variegated Syngonium Albo is going green this summer and everyone says "give it more light." That advice is wrong. Reversion is two cell layers fighting inside the growing tip, and summer is when the green one wins.
The recovery move is one cut. Prune back to a node whose bud still carries variegation, before the plant makes more than 2 green leaves. That removes apical dominance and biases new growth back toward the chimera.
Plant twist: "Jatropha berlandieri" and "Jatropha cathartica" are not two species. Kew lists berlandieri as a synonym of cathartica. You are paying twice for one plant. The real ID fight is a different one entirely.
The rule that saves it: do not water a leafless caudex. Wait for spring shoots, then soak-and-dry in a high-pumice mineral mix. Keep it above 50F. Cold plus damp is the rot trigger.