Fertilizers & nutrients
by Plagron
Plagron Terra Grow is a mineral liquid fertiliser with an NPK ratio of 3-1-3, designed specifically for the vegetative growth stage of soil-grown plants. With chelated trace elements that roots absorb directly, it delivers exactly what stems, branches, and leaves need during their most active development period. If you want vigorous, healthy vegetative growth without mixing five different bottles, this is the one to reach for. You can buy Plagron Terra Grow here at Azarius in a convenient 100ml bottle — ideal for testing the formula or running a small setup.
Plagron has been a go-to name in the grow world for years, and Terra Grow is their bread-and-butter veg feed. The 100ml bottle is enough to get you through a few weeks of feeding — handy if you're running a small setup or want to trial the formula before committing to a larger size. We've stocked Plagron products since the early days, and the consistent feedback from growers is simple: it works, it's easy to dose, and plants respond fast.
Terra Grow's chelated mineral formulation is the key differentiator: chelation wraps trace elements in organic molecules that prevent them from binding to soil particles, allowing roots to absorb them directly. This speeds up uptake compared to standard mineral salts. The practical result: faster response times when your plants are hungry, and fewer deficiency symptoms creeping in mid-veg. Iron, manganese, zinc, and the rest stay available in the root zone rather than locking out.
The 3-1-3 NPK ratio is deliberately balanced for vegetative growth. That equal nitrogen-to-potassium ratio provides nitrogen for leaf development alongside potassium for root strength and water regulation, while the lower phosphorus keeps things in check until the bloom phase demands more. Compare this to some veg feeds that lean heavily on nitrogen — those can push soft, stretchy growth that's more vulnerable to pests and stress. Terra Grow keeps things compact and sturdy.
Compared to BioBizz Bio-Grow, which is an organic liquid feed, Terra Grow gives you faster and more precise control over nutrient levels. Organic feeds rely on soil biology to break nutrients down before roots can use them, which introduces a delay. Mineral chelated feeds like Terra Grow skip that step. The trade-off is that organic feeds build long-term soil health, while mineral feeds are more of a direct-injection approach. Neither is wrong — it depends on your priorities.
One honest limitation: this is a 100ml bottle. At the maximum dosage of 5ml per litre, you get 20 litres of nutrient solution. If you're running 4 or more plants in decent-sized pots, you'll burn through this in a couple of weeks. It's a good trial size, not a season supply. For a full grow cycle, you'll want to size up.
Plagron Terra Grow is a mineral liquid fertiliser with a 3-1-3 NPK ratio, supplied in a 100ml bottle with a maximum root feed dosage of 5ml per litre of water. Below are the full specifications.
| Spec | Value |
|---|---|
| Brand | Plagron |
| Product | Terra Grow |
| SKU | HS1876 |
| Volume | 100 ml |
| NPK Ratio | 3-1-3 |
| Trace Elements | Chelated form |
| Growth Phase | Vegetative |
| Growing Medium | Soil (terra) |
| Max Root Feed Dosage | 5 ml per 1 litre of water |
| Max Foliar Spray Dosage | 2 ml per 1 litre of water |
| Recommended EC Range | 0.9–1.6 mS/cm (nutrient mix) |
| Max EC (nutrient water) | Less than 3.0 mS/cm |
| Dosage Scenario | Amount per Litre | Total Solution from 100ml Bottle |
|---|---|---|
| Seedlings / young plants | 2–3 ml | 33–50 litres |
| Established vegetative plants | 4–5 ml | 20–25 litres |
| Foliar spray (deficiency rescue) | 2 ml | 50 litres |
The vegetative phase is where a plant builds the structural framework — stems, branches, and leaf mass — that determines its capacity to produce flowers or fruit later. Weak veg growth means thin stems, sparse branching, and a canopy that can't hold heavy production. We've seen growers try to coast through veg on plain water and a bit of compost, then wonder why their plants flop over the moment they start producing. It's like skipping leg day — eventually, something gives.
Nutrient deficiencies during veg are sneaky. A nitrogen shortage starts as slight yellowing on lower leaves, easy to miss until it's climbed halfway up the plant. Iron deficiency shows as interveinal chlorosis on new growth — the leaves come out pale with green veins, looking like they've seen a ghost. By the time symptoms are visible, you've already lost days of growth. A properly balanced feed like Terra Grow with its 3-1-3 ratio and chelated trace elements keeps these problems from starting in the first place.
According to the European Monitoring Centre for Drugs and Drug Addiction (EMCDDA), indoor cultivation practices across Europe have become increasingly sophisticated, with growers paying closer attention to nutrient management during each growth phase. This aligns with what we see at the counter — more growers are moving away from guesswork and toward measured, phase-specific feeding schedules.
The foliar spray option is worth knowing about. If you spot a deficiency mid-grow, mixing 2ml per litre and spraying the leaves gets nutrients into the plant within hours rather than days. It's not a replacement for root feeding, but it's a genuinely useful rescue tool. Spray in the early morning or late evening — never under direct light, or you'll burn the leaves where the droplets sit.
Using Plagron Terra Grow correctly requires shaking the bottle, measuring 2–5ml per litre of water depending on plant maturity, and applying the solution at every irrigation during the vegetative phase. Here is the full step-by-step process.
Complete your Plagron feeding schedule with Terra Bloom for the flowering phase — same chelated mineral approach, different NPK ratio tuned for bud and fruit production. If you're growing in soil, Plagron Royal Mix substrate pairs naturally with the Terra line and gives your plants a solid foundation from day one. For pH management, order a Plagron pH Min or pH Plus alongside your nutrients to keep your solution in the optimal 6.0–6.5 range.
The number one mistake with liquid fertilisers is overfeeding, not underfeeding. We get growers coming in with burnt leaf tips, asking what deficiency they've got. Nine times out of ten, it's nutrient burn from doubling the recommended dose because "more must be better." With Terra Grow, stick to the 5ml per litre maximum. Your plants will tell you if they want more: healthy, deep green leaves with no tip burn means you're in the sweet spot.
The second most common issue is pH. Terra Grow works best in soil with a pH between 6.0 and 6.5. Outside that range, even chelated nutrients start locking out. If you're not measuring pH, you're guessing — and guessing gets expensive when you lose a crop. A basic pH pen costs less than a replacement batch of seeds.
From our counter: last month a customer brought in a photo of his plants — pale new growth, green veins, textbook iron deficiency. He'd been feeding Terra Grow at the right dose but his tap water was sitting at pH 7.4. The chelated iron was still locking out at that pH. We lent him a pH pen, he adjusted down to 6.2, and within four days the new growth came back green. The product was fine — his water wasn't. That's the kind of thing you only learn by measuring.
One thing we appreciate about the Terra line: it smells like fertiliser, not like a chemistry lab. Some mineral feeds have that sharp ammonia edge that makes mixing them in a small room unpleasant. Terra Grow has a mild, earthy scent — nothing offensive. Small detail, but if you're mixing feeds in your kitchen, it matters.
No. Terra Grow is formulated specifically for soil (terra) growing. The nutrient ratios and chelation are optimised for soil pH ranges. Plagron makes separate Hydro and Cocos lines — use those instead if you're not growing in soil.
At the maximum dosage of 5ml per litre, you get 20 litres of nutrient solution from one bottle. For 1–2 small plants, that's roughly 2–3 weeks of feeding. Larger setups will need a bigger bottle within a week or two.
There's no need to. Use Terra Grow during veg and switch to Terra Bloom when flowering begins. During the transition week, some growers taper down Grow while introducing Bloom, but Plagron's own schedules treat them as sequential, not simultaneous.
Plagron recommends an EC of 0.9–1.6 mS/cm for the nutrient mix itself. Total nutrient water EC should stay below 3.0 mS/cm. If your tap water already has a high EC, reduce the amount of Terra Grow accordingly.
Yes. Soil grows perform best at a pH of 6.0–6.5. Even with chelated trace elements, nutrient lockout happens outside this range. Measure your solution after adding Terra Grow and adjust with pH up or down as needed.
No. Terra Grow is a mineral-based fertiliser. If you're after an organic feed, Plagron offers their Alga Grow line, which uses algae-based nutrients. Both work — mineral feeds just give you faster, more precise control over nutrient levels.
Mix a maximum of 2ml per 1 litre of water and spray evenly on both sides of the leaves. Use it to address deficiencies quickly — foliar absorption is faster than root uptake. Always spray outside of direct light hours to avoid leaf burn.
You can order Plagron Terra Grow directly from Azarius. We stock the 100ml bottle and ship across Europe. Get yours and start feeding your plants a properly balanced veg-phase nutrient from day one.
Last updated: April 2026
