Feeding Charts—General Hydroponics

Before you get started, General Hydroponics has provided this helpful information, and a downloadable instruction sheet. All amounts are per 3.79 liters (1 US gallon).



  • 2.5 ML = 0.5 teaspoon

  • 5 ML = 1 teaspoon

  • 3.785 L = 1 gallon


  1. Keep nutrient solution temperature below 75F (24 C)

  2. Change nutrient solution every 7-10 days and top off with fresh water between nutrient changes

  3. For best results maintain nutrient solution pH between 5.5-6.5

  4. Keep nutrient solution aerated


  • Arid, bright, hot environments cause plants to drink more than if they are grown where it’s humid, dim and cool. Thus gardeners should use less concentrated nutrient solutions when growing conditions are more intense in order to lessen the risk of overfeeding.

  • The pH (acidity or alkalinity) of a nutrient solution affects the availability of the elements contained within. Use GH pH adjusters to maintain nutrient pH between 5.5-6.5.



For most of our hydroponic customers, this is the series we have always recommended, for flexibility amongst all your plant life and stages. This growth stage feeding chart will be everything you need to keep you on the basic track. Keep in mind, this is only a schedule for the most basic plant nutrition.


Download Guide


However, if the above feels too vague, or not complete enough for your needs, check out the below. This extensive chart has added in General Hydroponics Performance Pack (CaliMagic for example) to provide more complete nutrition, and then ALSO their custom choice additions, to provide the most complete process instructions, from rooting your cuttings (RapidStart), Ripening your fruits at the end, ArmorSi for an extra magical boost, and cleanup of your system after (FloraKleen).



Need something super simple? FloraNova is a liquid base 1-part fertilizer with a patented formula. It’s a concentrated and robust recipe your plants will love, in an easy-to-use liquid format you’ll love too.