What makes a plant do this?

ryan1918

Well-Known Member
Does anyone know why a plant does this, is a build up of something? I've only noticed it on 1 plant might have 1 more like that a different strain though
 

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Cellulose "knuckles". On some of my strians the lumps from main branches onto secondary branches can double mass when adding a low but steady dose of potassium silicate to the main base feed. Ive noticed it with and without silica and its definitely bigger on the silica fed plants.
What is potassium silicate please ?
 
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