Guide to collecting and planting Milkweed seeds for Monarchs Collecting Seeds: In late summer to early fall, look for milkweed pods that have turned brown and begun to split open. The Pumpkin Seeds Grow Pumpkins from Seed Harris Seeds HOW MUCH HUMIDITY DOES SOH NEED? I misted the SOH leaves and put this plastic cup over them to increase humidity, I just don't know how long. Should I take this off? Can succulent food be used for houseplants? Cactus are here at the farm! With thousands of species of succulents and cacti found around the world, many have been cultivated into perfect, slow growing houseplants that thrive with very little care.