Additives

Additives

  • GH Armor Si, 1 qt

    $15.80
    Armor Si™ is suitable for all types of plants during all stages of growth. It can be used for plants growing in hydroponics, coco coir and all types of media. Use as a growth enhancer with irrigation water or in addition to your regular fertilizers...
    $15.80
  • GH CALiMAGic, 1 qt

    $17.09
    CALiMAGicTM is a concentrated blend of readily available calcium and magnesium. It is formulated to assist fast growing plants by preventing secondary nutrient deficiencies. CALiMAGic helps optimize plant nutrition and enhances plant growth and...
    $17.09
  • GH Floralicious Plus, 1 oz POP

    $3.99
    NEW from General Hydroponics, convenient and attractive countertop displays. These 1 oz bottles all have flip-top drip-tops for easy application. With a usage rate of 1 ml per gallon, this 1 oz bottle of Floralicious Plus dilutes into 30 gallons! Plenty...
    $3.99
  • GH KoolBloom, 2.2 lbs

    $29.40
    KoolBloom •     Encourages abundant flowering • Facilitates ripening in annuals • Boosts production of essential oils and fragrances • Increases size and weight of fruits and flowers • Precisely formulated to...
    $29.40
  • GH Liquid KoolBloom Gallon

    GH

    $66.95
    Liquid KoolBloom® is a bulking agent that goes way beyond other bloom boosters. Enriched with stress-reducing vitamins and nutrient-transporting acids, it promotes heavy production of essential oils, fantastic flavors and increases fruiting and...
    $66.95
  • *Comes without testing bottle

    GH pH Test Indicator Fluid

    GH

    $7.99
    General Hydroponics® pH Test Kits make pH testing easy. Simply fill a test-tube halfway with nutrient, add a few drops of pH Test Indicator and observe the coloration of the liquid in the test vial. Many experienced growers prefer our pH Test Kit to...
    $7.99
  • GH pH Up, 1 gal

    $26.90
    To maximize plant growth, the pH content of your nutrients should be slightly acidic. Experienced growers consider the ideal pH for most crops to fall between 5.5 and 6.5. Users of General Hydroponics nutrient products generally do not experience...
    $26.90
  • GH pH Up, 1 qt

    $10.76
    To maximize plant growth, the pH content of your nutrients should be slightly acidic. Experienced growers consider the ideal pH for most crops to fall between 5.5 and 6.5. Users of General Hydroponics nutrient products generally do not experience...
    $10.76
  • GH RapidStart, 1 oz POP

    $6.49
    NEW from General Hydroponics, convenient and attractive countertop displays. These 1 oz bottles all have flip-top drip-tops for easy application. RapidStart provides accelerated root growth and is an excellent tool to have on hand during cloning,...
    $6.49
  • RapidStart Root Enhancer, 125 ml

    $26.49
    RapidStart enhances your growing experience by delivering a powerful blend of premium plant extracts, amino acids, and nutrients generating explosive root growth. Using RapidStart stimulates prolific root branching and development of fine root hairs that...
    $26.49