When to Put Cannabis Seedlings Under Light (Timing & Setup) You only have to water these plants once a month, so yes, even serial plant killers can keep them alive Contemporary Planter with Inset Handles Pennoyer Newman Rooted Hoya Mix Premium Hoya Soil Blend (1 Gallon) ONE TIME SUNFLOWER DROP I bought ONE packet of these rare sunflower seeds and out of it I was able to grow just 32 plants. That's it. No extras. No backup