Grotek is a Canadian brand specialized in creating nutrients, that was created by Greenstar Plant Products back in 1998 with the aim in mind to help amateur growers produce plants similar to those of professionals. Besides, the Grotek feeding charts are designed to increase yield in cannabis plants, regardless of the method of growing: soil, hydroponics, autoflowering plants and even one for growing cannabis organically.
Grotek feeding chart
All of Grotek’s fertilizer and additives are made using high quality ingredients, providing cannabis growers with a professional, simply way of obtaining incredibly impressive results. What’s more, they stock potent growth and flowering bases which contain the perfect balance of nutrients for your plants, as well as a large range of liquid and powdered additives to cover all of your plants’ needs.
Make sure to keep in mind that the recommended doses are simply a guide. Depending on the strain that you plan on growing, the climate, your experience are factors that may vary the doses. In fact, the best thing to do is to follow the feed chart but always prioritizing plants.
Grotek fertilizers and additives
Kickstart
This product is perfect for seedlings and clones thanks to its low doses of macro and micro-nutrients which increase initial growth and also help plants to bounce back after transplants.
Vitamax Pro
An excellent additive for giving your plants extra vitamins and essential amino-acids. In addition , it strengthens your plants and produces new cell walls which improve general health. By using this product, it is more difficult to stress plants.
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Vitamax Plus
This product is an upgraded version that has a slightly higher NPK than the pro version. This one is usually used when growing hydroponically, as your plants need more nutrients than usual and it’s perfect for automatic watering systems, fully dissolvable.
This handy powdered product is a growth additive that helps with development and its fully dissolvable in automatic watering systems and hydroponic tanks without causing any blockage. Moreover, its NPK is 18-36-1, so make sure that you don’t accidentally over-feed your plants.
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Bud Fuel Pro
This product is designed for the start of the flowering period as it essentially stops your plants from growing upwards and focuses more energy on producing branches and a lot more flowers. Also, it can be used in any growing medium, including hydroponics and aeroponics. Last, use it right before the flowering phase, during and until your buds start the fattening phase.
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Blossom Blaster / Pro
Blossom Blaster is a flagship offering from Grotek, boasts remarkable efficacy in enhancing flowering phases. Available in powdered form, it serves to expedite the onset of blossoming in plants. Employed at the inception of flowering stages, it effectively reduces node length while augmenting pistil proliferation. Esteemed for its potency, this product is enriched with substantial levels of phosphorus and potassium. However, it is not compatible with automated watering systems or hydroponic setups.
In addition, Grotek has introduced Blossom Blaster Pro, a variant designed to achieve identical results with a diminished NPK ratio, packaged in a liquid formulation. Particularly tailored for hydroponic cultivation, the Pro iteration of Blossom Blaster is indispensable for optimal results in such systems.
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Heavy Bud Pro
This product stands out as the ideal solution for those seeking to amplify bud size and enhance flavor profiles. By infusing plants with additional sugars and carbohydrates, this product profoundly influences terpene synthesis, ultimately elevating flavor, aroma, and effects. Its synergy with Monster Bloom yields exceptional results, culminating in the cultivation of truly remarkable flowers.
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Monster Bloom
Distinguished by its elevated PK content, it targets the critical bud fattening phase of plant development, typically occurring during the fourth or fifth week of flowering. Remarkably, its application triggers rapid and tangible effects, evidenced by a notable increase in bud density and compactness. Even in minute doses, this additive proves instrumental in maximizing final yields.
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Final Flush
It emerges as a specialized liquid formulation tailored to eliminate salt and nutrient residues. Enriched with citric and ascorbic acids, it efficiently dissolves lingering deposits within the substrate and roots of plants, rendering it particularly suitable for aeroponic and hydroponic systems. Moreover, it serves as a reliable remedy in instances of inadvertent overfeeding, ensuring optimal plant health and performance.
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Grotek Organics Nutrients
Grotek has introduced a range of products specifically tailored for organic cultivation – a departure from their predominantly mineral-based offerings. Now, enthusiasts can harness the professional-grade results synonymous with Grotek while adhering to a completely organic regimen for their marijuana plants.
Core – Vital – Micro Power
These three products, when used together in varying quantities, serve as the foundational nutritional components during both the growth and flowering stages of plant development. They are indispensable for organic cultivation.
Core, with its mild NPK composition, bolsters plant vigor and enhances substrate quality, while Vital supplements your plants with an extra dose of calcium, fortifying their cells to channel more energy into flower production (for coco cultivation, a slight increase in Vital dosage is recommended). Then, Micro Power enriches your plants’ soil, addressing any potential micronutrient deficiencies common in organic cultivation.
When combined, these three products form the perfect nutritional base for marijuana plants, ensuring success and organically delectable buds.
Root Force
This natural root stimulant accelerates root growth, allowing plants to expand their root systems maximally within their substrate. It imparts additional strength to plants, enhancing nutrient absorption, and is particularly beneficial after transplanting to rejuvenate plant vigor.
Growth Max
This natural additive, infused with extracts of seaweed, provides plants with a wealth of nutrients owing to its natural origin. It also contains fast-assimilating carbohydrates, enabling maximal nutrient uptake and plant development. Moreover, it amplifies final resin production.
Rype
Employed during flowering, Rype serves as an organic bulking agent. Its application induces a substantial increase in plant and flower size, enriching them with carbohydrates and sugars while significantly boosting resin production.
Black Pearl
Presented in granular form, Black Pearl is a soil additive that activates soil microorganisms when thoroughly mixed into the substrate. Not recommended for use in automated watering systems due to the risk of clogging, it can also be employed to rejuvenate previously used soils.
Synergy
A blend of mycorrhizae, Synergy fosters beneficial microbial activity in your plant’s substrate, thus benefiting root health and overall plant vigor through a symbiotic relationship.
How to follow the Grotek feeding charts
Grotek provides customers with four distinct charts for guidance: one for soil or coco cultivation, another for hydroponic setups, a third exclusively featuring organic products, and a final one tailored for autoflowering plants.
For seasonal plants in growth, four distinct stages stand out:
- Seedling: This is the initial growth stage after the seed germination. It allows the young plant to start developing its first leaves and roots, which are crucial for photosynthesis and the absorption of nutrients from the soil.
- Transplant: This stage involves moving the plant from its initial location to a new place or container. It is useful for providing the plant with more space to grow, better soil, or more suitable conditions for its development.
- Growth: In this phase, the plant increases in size and mass, developing more leaves, stems, and roots. This stage is crucial for strengthening the plant, allowing it to accumulate resources and energy for reproduction and flowering.
- Pre-flowering: This stage occurs just before the plant starts to produce flowers. It serves as a preparation period where the plant shifts its focus from general growth to the generation of reproductive structures. During pre-flowering, changes in the plant can be observed, such as the development of flower buds.
For plants with longer flowering periods, refer to the flowering chart, using the last week before root flushing as a reference. Always remember to perform a thorough root flush before harvesting. Also, note that the quantities indicated are per liter of water.
Soil/Substrate – Grotek feeding chart
GROWTH PHASE
Name | Sapling | Transplant | Growth | Pre-Flowering |
Kick Start | 2ml/L | |||
Black Pearl | 1g/L Soil | |||
Solo-Tek Grow | 1 ml/L | 2 ml/L | 2 ml/L | |
Vitamax Pro | 1 ml/L | 1 ml/L | 1 ml/L | |
Monster Grow Pro | 0,10 g/L | 0,10 g/L | ||
Bud Fuel Pro | 1 ml/L | |||
Total EC | 1,14 | 0,96 | 1,89 | 2.13 |
Total PPM | 570 | 479 | 947 | 1065 |
FLOWERING PHASE
Name | Week 1 | Week 2 | Week 3 | Week 4 | Week 5 | Week 6 | Week 7 | Week 8 |
Solo-Tek Bloom | 2ml | 3ml | 2ml | 3ml | 3ml | 3ml | 2ml | Root Flush |
Vitamax Pro | 1ml | 1ml | 1ml | 1ml | 1ml | 1ml | 1ml | Root Flush |
Bud Fuel Pro | 2ml | 2ml | 2ml | 2ml | Root Flush | |||
Blossom Blaster Pro | 1ml | 1ml | 1ml | Root Flush | ||||
Heavy Bud Pro | 2ml | 3ml | 2ml | 3ml | Root Flush | |||
Monster Bloom | 0,10g | 0,10g | 0,10g | 0,10g | Root Flush | |||
Total EC | 2,40 | 3,15 | 2,40 | 3,55 | 3,42 | 3,28 | 2,33 | Root Flush |
Total PPM | 1200 | 1575 | 1200 | 1778 | 1710 | 1643 | 1166 | Root Flush |
Hydroponics – Grotek feeding chart
GROWTH PHASE
Name | Sapling | Transplant | Growth | Pre-Flowering |
Kick Start | 2ml | 1ml | ||
Solo-Tek Grow | 1ml | 2ml | 2ml | |
Vitamax Plus | 1ml | 2ml | 2ml | |
Monster Grow Pro | 0,10g | 0,20g | ||
Total EC | 1,44 | 2,01 | 2,25 | |
Total PPM | 570 | 720 | 1005 | 1126 |
FLOWERING PHASE
Name | Week 1 | Week 2 | Week 3 | Week 4 | Week 5 | Week 6 | Week 7 | Week 8 |
Solo-Tek Bloom | 2ml | 2ml | 2ml | 2ml | 2ml | 2ml | 2ml | Root Flush |
Vitamax Plus | 2ml | 2ml | 2ml | 2ml | 2ml | 2ml | 2ml | Root Flush |
Blossom Blaster Pro | 2ml | 2ml | 1ml | Root Flush | ||||
Monster Bloom | 0,20g | 0,20g | 0,20g | Root Flush | ||||
Total EC | 2,40 | 2,20 | 2,05 | 2,79 | 2,79 | 2,79 | 2,52 | Root Flush |
Total PPM | 1200 | 1095 | 1095 | 1025 | 1395 | 1395 | 1260 | Root Flush |
Organic Chart – Grotek feeding chart
GROWTH PHASE
Name | Sapling | Transplant | Growth for early flowering plants | Pre-Flowering for late flowering plants |
Core | 1ml | 1ml | 2-3ml | 3-4ml |
Vital | 1ml | 1ml | 3ml | 2ml |
Micro Power | 1ml | 1ml | 2ml | 1-2ml |
Root Force | 0,5ml | 0,5ml | 1ml | – |
Growth Max | 0,5ml | 0,5ml | 2ml | 1ml |
Rype | – | – | – | 1-2ml |
Black Pearl | 20-40ml Soil | 20-40ml Soil | – | – |
Synergy | 0,25ml/L Soil | 0,25ml/L Soil | 0,25ml/L Soil | – |
Flowering phase
Name | Week 1 | Week 2 | Week 3 | Week 4 | Week 5 | Week 6 | Week 7 | Week 8 |
Core | 4ml | 4ml | 4ml | 4ml | 4ml | 3ml | 3ml | Root Flush |
Vital | 2ml | 3ml | 3ml | 3ml | 3ml | 2ml | 2ml | Root Flush |
Micro Power | 2ml | 2ml | 2ml | 2ml | 2ml | 1ml | 1ml | Root Flush |
Root Force | 2ml | 2ml | 2ml | 1ml | 1ml | 1ml | – | Root Flush |
Growth Max | 1ml | 1ml | 1ml | – | – | – | – | Root Flush |
Rype | – | – | – | 1ml | 2ml | 2ml | 3ml | Root Flush |
Black Pearl | 20-40ml Substrate during transplant | – | – | – | – | – | – | Root Flush |
Synergy | 0,25g/L Substrate during transplant | – | – | – | – | – | – | Root Flush |
Autoflowering Chart – Grotek feeding chart
Name | Week 1 | Week 2 | Week 3 | Week 4 | Week 5 | Week 6 | Week 7 | Week 8 | Week 9 | Week 10 |
Black Pearl | 1g/L Soil | – | – | – | – | – | – | – | – | – |
Solotek Grow | – | 2ml | 2ml | 2ml | – | – | – | – | – | – |
Monster Grow Pro | – | – | – | – | 0,15g | – | – | – | – | – |
Bud Fuel Pro | 2ml | 2ml | 2ml | |||||||
Solotek Bloom | 3ml | 3ml | 3ml | 2ml | 2ml | – | ||||
Blossom Blaster Pro | – | – | – | – | 1ml | – | – | – | – | – |
Heavy Bud Pro | – | – | – | – | – | 2ml | 2ml | 2ml | 2ml | – |
Final Flush | – | – | – | – | – | – | – | – | – | 3ml |