Ive never heard if this. Quite the opposite actually as ive always rehydrated my coco and then planted the seed in the wet coco but ive only grown coco. I would definitely water her. Weed typically likes a wet dry cycle and you’ve been keeping it dry which could be causing your problems. Ill tag some other growers and hopefully we can get you sorted out
And yes you can backfill if the pot gets knocked over or even if you left room in the pot and your plant is struggling to support itself (too leggy). I like to leave an inch or 2 at the top of the pots or planters im using to cover the stem up some more and support it better
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