My Moon Flower Seeds Have Grown To About 3” And Stopped. 2nd Year This Has Happened. What’s My Issue?

Question

year in a row this has happened. What’s my issue?.

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Answer 1

This could be due to three main factors. Too little light, too much water, or too little nutrients.

Potting them up to larger pots with substantial soil will likely mitigate the issue.

https://www.gardeningknowhow.com/ornamental/vines/moonflower/growing-moonflowers.htm