10 Best Premium Plant Fertilizers for Indoor & Outdoor Use 2025

If you're a plant enthusiast looking for premium fertilizers for both indoor and outdoor use, you're in luck. We've reviewed and scored many products in the premium plant fertilizers for indoor and outdoor use category, and we found products ranging from a 7.1 score up to a 9.5 score. But there's one product that stands out among the rest - and that's PERFECT PLANTS' Liquid Cactus & Succulent Fertilizer. This premium fertilizer is specially formulated to provide your cacti, succulents, aloe, and other live plants with all the nutrients they need to thrive. And with its versatile indoor and outdoor use, it's the perfect solution for any plant parent looking to give their greenery a little extra love. But don't just take our word for it - our expert reviewers gave PERFECT PLANTS' Liquid Cactus & Succulent Fertilizer the highest score of any product on our list. So, if you want to ensure your plants are getting the best of the best, we highly recommend giving this product a try. And if you're curious about the other premium fertilizers we reviewed, be sure to check out our top 10 product reviews page for all the details. Trust us - your plants will thank you!