# CALMAG — Holiplants

Web page: https://holiplants.com/en/produits/calmag
Other languages: [fr](https://holiplants.com/fr/produits/calmag.md) · [de](https://holiplants.com/de/produits/calmag.md) · [es](https://holiplants.com/es/produits/calmag.md) · [it](https://holiplants.com/it/produits/calmag.md)

- **CALMAG** — Add-on · Universal — Ca · Mg · boron 0.03 % · water-dependent — from CHF 39.90 (incl. VAT)

Universal Ca/Mg supplement, boron targeted against hollow stems. Zero chloride. Compatible with any nutrient line.

**Reinforced boron. Solid stems.** The calcium-magnesium supplement with boron actually dosed — pure nitrates, no chloride, no additives.

- CaO 3.3 % · MgO 2.0 % — Calcium · Magnesium
- 0.03 % — Soluble boron
- 1 · 5 · 10 L — + IBC 1000 L on request

- **Prevents hollow stems** (0.03 % boron): Boron and calcium together form the network that stiffens cell walls. Without it, stems turn hollow and brittle. Dosed inside the useful physiological window.
- **Pure nitrate only** (0 chloride): Calcium and magnesium supplied exclusively as nitrate. No chloride building up in the substrate with every watering.
- **Nothing else** (4 ingredients): No preservatives, no acidifiers: in a mineral matrix no microbe survives — they would serve no purpose.

Guaranteed analysis (% w/w):

| Element | Value |
|---|---|
| Total nitrogen (N) — nitrate | 3.30 % |
| Calcium (CaO) | 3.26 % |
| Magnesium (MgO) | 2.02 % |
| Boron (B) soluble | 0.03 % |
| Iron (Fe) EDTA chelated | 0.056 % |

Dosage — Simple, all cycle long.
- 0.5 mL / L — maintenance: CaO 19 ppm · MgO 12 ppm · B 0.15 ppm · Fe 0.3 ppm; EC impact: +0.13 mS/cm
- 1.0 mL / L — prevention: CaO 38 ppm · MgO 24 ppm · B 0.30 ppm · Fe 0.7 ppm; EC impact: +0.25 mS/cm

⚠ Do not exceed 1 mL/L. Always dilute in the irrigation water — never mix concentrates directly.

**Why put boron in a CalMag?**

Because calcium can't do its structural job without it. Calcium and boron together form the pectic network of cell walls — a CalMag without boron is structurally incomplete.

**Is it compatible with my base and substrate?**

Yes. CALMAG completes any routine, whatever the brand of your base — and on every substrate: soil, coco, hydro, rockwool, soilless.

**How much should I use?**

0.5 mL/L for maintenance, up to 1 mL/L for prevention. The dosage is that of a classic CalMag; what changes is what it delivers at that dosage.

## Stockists (Switzerland)

- **La Feuille d'Or** — Grow shop · Montreux. Rue de la Corsaz 15, 1820 Montreux. Tel. 021 963 35 25. https://lafeuilledor.ch
- **Huboma Sàrl** — Horticultural supplies · Biel/Bienne. Route de Soleure 154, 2504 Bienne. Tel. +41 32 322 40 02. https://www.huboma.ch
- **GROWBOX.CH** — Growshop · Uetendorf. Altelsweg 1, 3661 Uetendorf. https://growbox.ch
- **Wallis'Roots** — Growshop · Headshop · Conthey. Rue des Fougères 23, 1964 Conthey. Tel. 079 781 09 33. https://www.wallisroots.ch
- **Sodium** — Growshop · Geneva. Rue Caroline 27, 1227 Acacias, Genève. Tel. 022 342 91 91. https://sodiumgeneve.ch

## Machine-readable data

- Product catalog API (JSON): https://holiplants.com/api/v1/catalog/en
- OpenAPI: https://holiplants.com/api/v1/openapi.json
- llms.txt: https://holiplants.com/llms.txt