On mobile you could also have a look at NewPipe. It does not have automated downloads but it shows you a simple list of all the videos from your subscriptions without any algorithm-based recommendations. It shows no ads and is fully open source.
Also supports plenty of services other than YouTube.
Check out… https://www.lawnsite.com/threads/polysand-in-the-winter.485549/
Especicially watering it sounds like a really bad idea.
Why not just wait until late spring?