Welcome to gardening and congrats on being such a conscientious grower. The answers are: 1. Yes, half a cap for 2 gal pot or half a teaspoon for 6 in pot is fine. 2. You only need to feed once every 6 months as Osmocote releases nutrients slowly 3. All indoor plants benefit from Osmocote as does any plant that likes a slow and gradual release of nutrients. I do like Miracle-Gro for fast growing plants such as annuals and I often use the two together for potted annual plants. 4. In spring add the product to the potting soil and then you don't need to add more for six months. Remember that as the soil warms the Osmocote releases the nutrient a little bit at a time. This way the plants get a bit of fertilizer when they are young and the soil is cool but more is released in mid summer when they are growing fast and the soil is warmer. Keep growing, Marianne Binetti