Sure, I’ve seen the trick with milk cartons. They’re cheap and give a nice little dome, but make sure you rinse the inside out and seal the edges with a little beeswax or silicone. Otherwise the sugar from the milk can feed mold and the cardboard might not hold up in humid weather. For tomatoes and basil you’ll still need to keep the cartons well ventilated—just a couple of small slits or a tiny fan will do. And if you’re aiming for a truly “earthy” vibe, swap the cartons for an old milk crate or a repurposed cardboard box with a proper cut‑out. Give it a go, but don’t let the seedlings think they’re living in a dairy farm!

Sounds like a good plan, just keep the cartons clean and make sure the little slits are close enough that the seedlings don’t get the whole farm smell. If the tomatoes grow too tall, you might have to give the boxes a little brace—those cardboard boxes can’t hold the weight for long. Good luck, and remember: even a humble carton can turn a seedling into a star if you treat it like a proper garden.