The Plagron Top Grow Box 100% TERRA is a complete nutrient kit that covers your cannabis plants from first true leaves to final flush — five bottles, one box, enough feed for roughly 1m² of soil. If you've ever stood in front of a wall of nutrient bottles wondering which combination actually works together, this is the shortcut. Plagron formulated the whole line to play nicely with itself, so you're not gambling on cross-brand compatibility.
Why the Plagron Top Grow Box 100% TERRA makes sense
This is the kit we'd hand a first-time soil grower without thinking twice. Plagron has been making nutrients in the Netherlands since 1992, and their TERRA line is built specifically for soil-based cultivation — not coco, not hydro. You get the two base feeds (Terra Grow and Terra Bloom) plus three boosters that target the moments where most beginners lose yield: root establishment, nutrient uptake, and the final fattening stage.
The honest limitation: this is a soil kit. If you're growing in coco or running a hydro setup, you want the COCO A&B or HYDRO line instead — same brand, different chemistry. And the Terra Bloom bottle is 1L while the rest are 100ml, which trips people up the first time they unpack it. That's not a mistake; you simply use more bloom feed across the flowering stretch than you do boosters.
What's actually in the box
Five bottles, each with a defined job. Here's the breakdown:
| Product | Volume | NPK | Job |
|---|---|---|---|
| Terra Grow | 100 ml | 3-1-3 | Vegetative base feed — nitrogen-led for leaf and stem |
| Terra Bloom | 1 L | 2-2-4 | Flowering base feed — potassium-led for bud development |
| Power Roots | 100 ml | 0-0-1 | Root stimulator — use early and after transplant |
| Pure Zym | 100 ml | — | Enzyme blend — breaks down dead root matter, keeps soil clean |
| Green Sensation | 100 ml | 0-9-10 | Bloom booster — phosphorus and potassium for the final weeks |
Best soil to pair the TERRA box with
Plagron's own Lightmix or Growmix are the obvious match — both are pre-fertilised soils designed around this exact feed schedule. Lightmix has minimal pre-charge so you start feeding from week one; Growmix carries about three weeks of nutrition built in, so you wait before reaching for the Terra Grow. Either works. If you're using a different brand of soil, just check the pre-charge level and adjust your start date accordingly.
Complete your setup with a bag of Plagron Lightmix or Growmix — both are formulated to work hand-in-hand with the TERRA feed schedule. A pH meter and a 5L watering can with a fine rose are also worth having on the bench before you start.
How to use the Top Grow Box 100% TERRA
Plagron prints a full feed schedule on each bottle and inside the box. The short version looks like this — but always read the label, because dosing depends on your soil's pre-charge and your water's starting EC.
- Week 1–2 (seedling/early veg): Plain water with a few drops of Power Roots. Don't feed yet if you're using Growmix.
- Week 3 onwards (vegetative): Add Terra Grow at the manufacturer's stated dose, plus Pure Zym to keep the root zone clean.
- Flip to flower (week 1 of 12/12): Switch from Terra Grow to Terra Bloom. Keep Pure Zym in the mix.
- Mid-flower (weeks 3–6): Continue Terra Bloom. Introduce Green Sensation in the last 4 weeks per the bottle schedule.
- Final week: Flush with plain pH-adjusted water to clear residual salts before harvest.
Strains differ — sativas eat lighter than indicas, autos run shorter, and some cultivars sulk if you push the EC. Start at half the recommended dose for the first feed and work up. Yellowing tips mean you've gone too hard.
Specifications
| Brand | Plagron |
| Product type | Complete nutrient kit (soil) |
| Coverage | ~1m² grow area, full cycle |
| Bottles included | 5 (Terra Grow, Terra Bloom, Power Roots, Pure Zym, Green Sensation) |
| Total volume | 1.4 L (1L bloom + 4×100ml) |
| Suitable for | Soil cultivation only |
| Origin | Netherlands |
| SKU | HS2332 |
From our counter
The mistake we see most often: growers dosing all five bottles every single watering from week one. That's not how it's designed. Power Roots is front-loaded, Green Sensation is back-loaded, and the bases overlap for about a week during the veg-to-flower transition. Treat the schedule as a relay race, not a buffet.
Frequently Asked Questions
Is the Top Grow Box 100% TERRA enough for one full grow?
Yes — for a 1m² soil grow with 2–4 plants over a full veg-and-flower cycle, the kit covers it. Heavy feeders or a longer veg might leave you short on the bloom bottle near the end.
Can I use this kit in coco coir or hydro?
No. The TERRA line is formulated for soil. Plagron makes separate COCO A&B and HYDRO ranges with different mineral ratios — using TERRA in coco will throw off your EC and pH balance.
Do I need to add Cal-Mag or extra supplements?
Usually not, if you're using Plagron's own soil and reasonably soft tap water. If your water is very soft (under 100 ppm) or you're growing in a peat-heavy mix, a Cal-Mag supplement can help. Check the runoff EC first.
What's the difference between this and the 100% NATURAL box?
The NATURAL box uses organic feeds (Alga Grow, Alga Bloom) — slower release, fully organic certification. The TERRA box uses mineral nutrients with some organic components — faster response, easier to dial in for beginners. Both work well; pick based on whether you want organic or mineral feeding.
How long does an opened bottle last?
Plagron lists roughly 2 years for unopened bottles and around 6–12 months once opened, stored cool and dark. Don't keep them in a hot grow tent — heat degrades the chemistry. A cupboard or shelf at room temperature is fine.
Can I mix all five bottles in the same watering can?
Add them one at a time to the water — never bottle-to-bottle — and stir between each. Concentrated nutrients can react if poured directly together. Always check pH after mixing; aim for 6.0–6.5 in soil.
Last updated: April 2026
