What underlying issue often causes the plant to develop long, weak, 'leggy' stems with widely spaced leaves?
Answer
Insufficient light levels.
When light levels are low, the plant stretches its internodes desperately seeking brighter light, leading to long, weak stems that appear sparse.

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Let's Stake Up my Arrowhead plant and Philodendron Hastatum Silver
WHAT TO DO WITH A LEGGY SYNGONIUM/JoyUsgarden - YouTube
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