Bud Booster

Regular price$85.00
Tax included.

Massboost is a highly concentrated organo-mineral Calmag that contains calcium, magnesium, nitrogen, sulphur and L-amino acids to support healthy, vigorous growth through both veg and flower. Massboost is the calmag of choice for indoor and outdoor coco, peat and soil growers in run-to-waste systems.

For cultivators running hydroponic, DWC, recirculating or fertigation systems, use APTUS’ Mineral-Calmag. *add hyperlink to mineral-calmag

Organo-mineral calmag & bud booster

Application - Root drench and foliar spray

Available Sizes

    Feed Programs

      Feeding Type and Amount

      Clones & seedlings
      0.25 ml per 1L

      Regular feeding (vegetative)
      0.25 – 0.33 ml per 1L

      Regular feeding (flowering)
      0.25 – 0.5 ml per 1L

      Foliar spray (maintenance)
      2 ml per 1L

      Foliar spray (repair)
      4 ml per 1L

      Add MASSBOOST to your reservoir every feeding as per feed schedule. If using MASSBOOST as a bud booster additive with another regime, add 0.5 ml per 1L in weeks 3, 5 and 7 of the flowering phase. When mixing with any phosphorus supplements (PEAKBOOST or mineral fertilisers), be sure to mix one into the solution before adding the other to minimise the chance of forming calcium-phosphate bonds which render both unavailable to the plant.

      Calcium largely comprises the cell walls of plant cells which gives them structure. An uninterrupted supply of calcium allows for stout flowers, stems, leaves and the continued healthy formation of new plant tissue.

      It is important to have available calcium to prevent blossom end rot, dropped flowering sites and necrosis of leaf tissue.

      Chelated magnesium allows for optimal supply to enzymes in the plant which require the element to perform their tasks properly.

      Magnesium is the central core of the chlorophyll molecule. A chelated supply allows for continued robust chlorophyll development allowing the plant to perform photosynthesis at optimal levels.

      MASSBOOST is an organo-mineral plant booster that prevents calcium (Ca) and magnesium (Mg) deficiencies while stimulating powerful fruit set and development.

      Provides organic nitrogen from L amino acids that stimulate plant development.

      High bioavailability, 100% water soluble and leaves no residue.

      Combines calcium (Ca) and magnesium (Mg) with L-amino acids to eliminate or correct deficiencies.

      Improves structure and firmness of the flower and fruit.

      Provides the extra boost plants need during certain plant-development phases and other important natural bio-stimulants.

      Calcium (Ca) – Integral structural element to plant cells

      Magnesium (Mg) – Central element in the formation of chlorophyll, source of photosynthetic activity, enzymatic process activator

      Pay attention when mixing PEAKBOOST and MASSBOOST as they can react with each other. Always add one, dilute and mix, then add the other.

      If using multiple phosphorus based products, take care when adding MASSBOOST as phosphorus and calcium, when combined in high concentrations, may cause deposits and residues.


      No, not unless you’re only using MASSBOOST as a foliar spray. As a root drench you only need to use either MASSBOOST or Mineral-Calmag, not both.

      While MASSBOOST and MINERAL-CALMAG are both calcium/magnesium additives, and are both formulated for the same stages in plant development, they are two very different products, formulated for two different styles of cultivation.

      MASSBOOST is an organo-mineral formula that contains both organic and mineral inputs. The organic inputs are L-amino acids (otherwise known as hydrolysed proteins) which are responsible for making MASSBOOST the most effective and most bioavailable calmag on the market. These organic inputs are also what makes MASSBOOST inadequate for hydroponic, dwc and fertigation systems. MASSBOOST is best suited for indoor and outdoor cultivators growing in coco, peat or soil. 

      MINERAL-CALMAG is a 100% water-soluble mineral formula that has excellent pH stabilising capabilities and can be left in a nutrient tank or reservoir for up to 14 days with no signs of degradation. MINERAL-CALMAG is extremely clean and will not cause salt build-up or blockage in fertigation lines, drippers, feeders or spray rings. MINERAL-CALMAG is suitable for every substrate and every method of cultivation.

      The choice of which APTUS calmag to use should be based entirely on your substrate and cultivation method.

      If you’re growing in rockwool or water, then you would use MINERAL-CALMAG. You should not use any organic fertilisers when growing with rockwool or water as a substrate.

      If your irrigation method is run-to-waste and you grow in coco, peat or soil (providing you mix fresh feed daily/bi-daily) then MASSBOOST is the preferred choice.

      If you’re running a recirculating hydroponic system, fertigation system or long multiday reservoir, then MINERAL-CALMAG is the preferred choice.

      Yes, there are a lot of outdoor soil growers that use MASSBOOST as a densifier and bulking product for their sun-grown soil crops. For this application we commended root drenching at least once per week in weeks 3 and 5 for shorter 49-63 day flowering plants, and again at week 7 for longer flowering plants.

      MASSBOOST is very effective for the quick recovery of nitrogen, calcium and or magnesium deficiencies when applied as a foliar spray through veg and early flower (note: it’s not recommended to foliar spray after week 2 of flower). Experienced Indoor and outdoor cultivators incorporate MASSBOOST into their foliar program for heavier feeders (i.e. magnesium hungry phenotypes) to prevent nitrogen, calcium and magnesium deficiencies.

      Preloading healthy plants by adding 2 – 4 ml per litre to your foliar program for the last week of veg and first 2 weeks of flower is a great way to prevent nitrogen, calcium and magnesium deficiencies in heavy feeders.


      For best results, foliar spray with Fasilitor, startboost and MASSBOOST in veg, and Fasilitor, Bloomboost and MASSBOOST for the first 2 weeks of flower.

      Vegetative foliar spray

      1 ml per 1 litre

      1 ml per 1 litre

      2-4 ml per 1 litre
      MASSBOOST *optional


      Flower foliar spray

      *Note: it’s recommended to foliar spray for the first 2 weeks of flower only.

      1 ml per litre

      1 ml per litre

      2-4 ml per litre
      MASSBOOST *optional

      Feed Programs


      This program is the easiest, most concentrated, low cost program on the market. The pH stability is so reliable you can mix and set your reservoir on a given day and it will read exactly the same (+- 0.05) seven days later with no adjustment in between.


      This program is the absolute gold standard of quality, flavour, oil production and shelf life. This is the program for the grower looking to produce the absolute best flower they can or any extraction artist looking to increase the quality, colour and yield of their extracts.


      Access to the OG programs that include Soil PRO and Soil BASIC.

      All of these programs are available for download.

      Faster, Healthier
      Root Development

      Thicker, Stronger

      Higher Quality
      Fruits & Flowers


      Superior Flavour

      Increased Bag