This is genius! You don’t need dangerous darts – see what they used HERE
The Empress of Dirt says: Grow bags can be used for annuals including flowers and vegetables or perennials you plan to overwinter in a protected storage area. I use mine for food crops like salad greens, herbs, carrots, tomatoes, and placing annual flowers around the garden. Read more HERE
Plant according to zone – figure out your zone, then get to planting!