Vitamax Pro is a growth additive from the nutrient brand Grotek. This article covers three things: what the manufacturer says the product does, how it is meant to be used, and how you can check whether it helps in your conditions in Thailand or Southeast Asia.
All the benefits below come from the product description. The description gives no trial results, and no figures for root weight, growth rate or yield. Read them as what the product is designed to do, not as proven results.
What Vitamax Pro Is and When It Is Used
Grotek calls Vitamax Pro a multi-functional growth enhancer. That means one product meant to do three jobs: support root growth, improve nutrient uptake and make the plant more resistant to stress.
The product description presents it as an add-on to your normal feeding, not as your main fertiliser. Keep your usual base nutrients and add it on top.
The product is aimed at the vegetative stage. This is the early phase when the plant grows roots, stems and leaves under long light hours. Grotek says you can keep using it into the transition to flowering. That is the first weeks after you switch to flowering light hours, when the plant stretches.
What Grotek Says It Does
The manufacturer lists five benefits:
- Stronger roots. A larger root system can take up more water and nutrients.
- More natural vitality and resistance. The plant should cope better with stress.
- Stress tolerance. Grotek says the product reduces plant stress in harsh conditions. Its examples are transplanting, pruning and high temperatures.
- Faster overall growth. The plant should develop healthily and build a solid base for a high yield later.
- More efficient metabolism. Metabolism means the chemical processes inside the plant that turn water, light and nutrients into new tissue.
None of these claims comes with a number. The only way to know what Vitamax Pro does for your plants is a side-by-side test, described further down.
Translator’s note: Grow rooms and greenhouses in Thailand often run at 30–35 °C. A product that claims to reduce heat stress does not lower the temperature. If leaves curl in the heat, fix the airflow and cooling first (grow room climate control). In hydroponics, also check the reservoir temperature. Roots that turn brown and slimy point to root rot, and an additive will not cure it. Use Vitamax Pro on plants that are already in workable conditions, not as a rescue.
How to Use It
Dose. The product description says only “apply at the rate given on the product label”. It gives no number. Read the label on the bottle you actually buy, and check Grotek’s official feeding chart for your growing system. You need to do this because the label is the only dose the manufacturer stands behind.
Timing. The description says to use it in weeks 1–4 of the vegetative stage. It also says you can continue into the transition to flowering. These two statements do not fully match. Follow the current Grotek feeding chart for the exact weeks. Some retailer listings describe it as usable from seedling through to harvest, so check which instructions come with your bottle. Write down the week you stop, so you can compare one run with the next.
Combining with other Grotek products. Grotek says Vitamax Pro can be used together with three other products from its range:
- Monster Bloom, a phosphorus–potassium booster for flowering.
- Gro-Silic, an additive meant to strengthen stems and leaves.
- Cal-Max, Grotek’s calcium and magnesium supplement.
Monster Bloom is a flowering product. In practice it overlaps with Vitamax Pro only if you use Vitamax Pro into the transition period. Check the feeding chart to see which weeks each product covers.
Mixing. Add one product at a time to the water and stir before adding the next. Measure pH and EC only after everything is in. You do this because each additive can change the pH, and only a reading of the final mix tells you what the roots actually get.
Which Grows It Is Aimed At
Grotek recommends Vitamax Pro for:
- growers who want to build strong plants from the start
- the vegetative stage, to prepare plants before flowering
- indoor rooms, greenhouses, and automated or hydroponic systems
Translator’s note: Before you put any new additive into an automated or drip system, mix it in a bucket at label rate and leave it for a few hours. Check whether anything settles or clogs. This tells you whether it is safe for your filters and drippers. Also clean the filters more often in the first weeks. In a power cut, pumps and air stones stop and the roots run short of oxygen. No additive protects against that. A backup power unit for the air pump does far more.
Test It on a Small Batch Before the Whole Crop
You need to test because the product description gives no figures, and your heat, water and growing medium differ from the maker’s. A small test costs little and shows whether the product is worth the money for you.
- Choose two groups of the same cultivar and age. Ideally use clones from the same mother plant. Then any difference comes from the product, not from genetics.
- Keep everything else the same. Use the same medium, light, water and base nutrients. Only one group gets Vitamax Pro, at label rate, in vegetative weeks 1–4. This group is the treated group, and the other is your comparison group.
- Record each week. Note height, leaf colour and any drooping after transplanting or pruning. These are the stresses Grotek says the product helps with, so look most closely at them.
- Check the roots at transplanting or at the end of week 4. Photograph the root ball of a few plants from each group. This shows whether the “stronger roots” claim holds in your setup.
- If you can, follow both groups to harvest. Weigh the dried flower from each group separately. This shows whether the “base for high yield” claim turns into a real difference.
- Work out the cost per plant. Compare it with any gain you measured. This tells you whether to use the product on the whole crop.
Translator’s note: Run the test in the hottest months, or when you transplant in strong heat. That is when the heat-stress claim matters most in Thailand. One test is a starting point, not proof. Repeat it once before you change your whole feeding programme.
Translator’s note on buying: Buy through Grotek’s official distributor in Thailand, and ask for the Thai label and registration details. Unofficial bottles can be fake, repackaged or out of date. To see how fertiliser registration and labels work under the Thai Fertilizer Act B.E. 2518 (amended by the Fertilizer Act (No. 2) B.E. 2550), read Verifying a Fertiliser Is Legally in Thailand. Whether a growth enhancer like this must be registered as a fertiliser in Thailand, and in which category, is a question for the distributor. Ask to see the registration details before you buy.
Share Your Results
If you have used Vitamax Pro, post your setup below. Include your medium, the dose from your label, the weeks you used it, the room temperature and what you saw compared with untreated plants. Questions about dose or mixing are also welcome here. For where other growers buy it, ask in the General Nutrients Q&A section.