>>211917892>fried in direct sunlightIt's not the UV that would kill it, your weed plant needs it, it's a tropical plant, but it would rather be the heat and lack of moisture caused by exterior conditions. Also to watch out for is the wet+obscurity conditions that would make it develop mold.
So it depends on the strain, some strains were designed to stand outside conditions, other strains need a quasi lab equipment to grow properly.
>bury most of the stemDon't bury the stem that's a sure way to give it a mushroom infections.
I believe - I'm not a specialist I just have a little green thumb - that if you give it sunlight and give it a bit of mild fertiliser (something natural like a little bit of wood ash and nettle manure) it will take a more regular shape... When you water it (not too much either because it's small) in your watering can, you can put a little ash and a little nettle that you let infuse in the water.
But what it mostly needs here is UV radiation, that's a surething.