Comparison: Best All Purpose Plant Food Liquid (Updated | Nov 11th)

For vigorous foliage growth, a balanced 10‑10‑10 or 12‑4‑8 ratio works well for both outdoor gardens and indoor plants. If you want more blooming or fruiting, look for higher phosphorus (the middle number) such as 10‑15‑10. Indoor houseplants often thrive on lower nitrogen formulas like 4‑3‑4, which promote steady growth without leggy stems.

Organic fertilizers such as True Organic and Espoma use natural ingredients, kelp, and humic acids, which improve soil health over time and are safe around pets. Synthetic products like Miracle‑Gro provide quick, visible growth but may require more frequent applications. Choose organic if you prioritize long‑term soil biology; choose synthetic for rapid results on demanding crops.

Purived’s 16 oz bottle makes up to 50 gallons, covering roughly 600 sq ft, making it the most cost‑effective per area. Miracle‑Gro Water Soluble (1.5 lb) also covers about 600 sq ft, but its price point is typically higher. Smaller bottles like the 4 oz Schultz provide limited coverage and are best for spot‑treating specific plants.

Gardenwise includes 6 % chelated iron, eliminating the need for an extra iron boost on chlorotic plants. Most other formulas, including Miracle‑Gro and Schultz, do not contain iron, so you may need a supplemental iron product for plants showing yellowing leaves. Check the label for iron content if your soil is alkaline.

Most manufacturers recommend feeding every 7‑14 days during the active growing season; Miracle‑Gro suggests a 7‑14 day interval, while Espoma and True Organic advise every 2 weeks. Over‑application can burn roots, so follow the dilution instructions carefully. For indoor plants, a bi‑weekly schedule usually provides sufficient nutrients without buildup.

High‑concentration products like Easy Peasy’s 4‑3‑4 blend require only a half‑teaspoon per two cups of water, lasting longer and reducing waste. Regular mixes such as Purived or Miracle‑Gro need larger volumes per gallon, which can be more convenient for large gardens but may result in more frequent purchases. Choose concentration based on the size of your planting area and how often you prefer to mix.

Purived explicitly lists compatibility with full and semi‑hydroponics, making it a versatile choice for indoor growers. Most other products, including Schultz and Miracle‑Gro, are formulated for soil drench or foliar feeding and are not recommended for hydroponic setups. Always verify the label for hydroponic suitability before using.

Purived boasts a two‑year shelf life, while many liquid fertilizers retain potency for 12‑18 months if stored in a cool, dark place. Organic blends can sometimes degrade faster due to natural ingredients, so keep lids tightly sealed. Proper storage prevents clumping and preserves nutrient effectiveness.