Alright, when I watered both these plants in I used a little fertilizer. See my fertilizer is a little blue. I did that because when the plants start growing their roots I want some nutrients that are readily available to them. There's something for them to start growing on with. You can use any general-purpose fertilizer from a garden center. There are some that are specifically for houseplants, indoor, outdoor, high acid. I think just a general all-purpose will be fine like a 20-10-20. I would use it full strength. You can water with every watering or once a month. It's how fast you want your plants to grow. If you want them to really take off, you could use fertilizer with every watering. If you don't want a plant that's going to become overgrown, you could fertilize it a little less. I would suggest maybe once a month would we fine.