I just put together this planter with all my random small cacti and it turned out pretty cool : r cactus Amazon.com : Espoma Potash 0 0 60 Potassium Fertilizer. Use for All Plants requiring Potash Supplement Including Trees, Shrubs, Vegetables and Flowers. Granular for Easy Application. 6 lb. Bag : Fertilizers : Patio, Lawn & Garden Licorice Plant (Glycyrrhiza glabra) Seeds for Planting Heirloom, Non Pure Asia Seeds First time growing kale from seed and it is doing well.