Cal-Mag
Why your plants need Cal-Mag
Rust spots on the bottom leaves is magnesium. Marks on the new growth up top is calcium. In coco under LED you are usually short of both.
Six on the shelf, and they are not the same bottle. Start here.
Canna Calmag Agent
- Balanced calcium and magnesium
- Hardens soft and RO water, raises EC to a stable base
- Formulated for Australian and NZ tap water
- Made for CANNA COCO substrate
| 1L | $50/L | $50 |
| 5LBEST VALUE | $30/L | $150 |
This is the bottle you use every single feed
In coco on RO water cal-mag goes in every time you mix, so it is the fastest bottle in the tent to run dry and the one where size actually costs you money.
Spots up top is calcium
Calcium cannot move inside the plant. Once it is in a leaf it is stuck, so you see it in new growth.
Spots down the bottom is magnesium
Magnesium moves. When it runs low the plant robs the old leaves, so the bottom goes first.
Coco takes its cut before you do
Coco holds calcium and magnesium and hands back sodium and potassium. Add LED and RO water and there is nothing left to start with.
Cal-mag goes in first, and the rates are not the same
Into the water before anything else. Add it after your base and calcium and phosphorus meet at full strength, which causes lockout instead of a fix. Rates differ a lot: Total Horticulture is 1 mL per litre, Athena is 2.5 mL per gallon. Use the bottle you bought, not a number off a forum.
Read your own plant before you buy anything.
Send us a photo, or ring (03) 9052 5233 and describe where the marks are. Half the time it is not a shortage at all, it is pH, and you do not need to buy anything. We would rather tell you that than sell you a bottle.
Only worth reading if the pick above is not you.
- Readily available calcium and magnesium
- Plus iron, nitrogen, boron and zinc
- Strengthens cell walls, supports chlorophyll
| 1L | $16/L | $16 |
| 5L | $11/L | $55 |
| 20LBEST VALUE | $10/L | $190 |
- Calcium, magnesium, iron and nitrogen
- Holds overall elemental balance
- Made for RO water, coco and rockwool
| 0.9L | $37/L | $33 |
| 3.78L | $19/L | $70 |
| 18.9LBEST VALUE | $16/L | $300 |
- Chelated calcium, magnesium and iron
- Built to correct a deficiency, not just prevent one
- Sits alongside the Advanced Nutrients line
| 250mL | out of stock | $15 |
| 500mL | $58/L | $29 |
| 1LBEST VALUE | $55/L | $55 |
| 4L | out of stock | $160 |
All in stock. Price shown is the smallest size.
| Product | Key ingredient | Best for | From |
|---|---|---|---|
| Canna Calmag Agent | Balanced calcium and magnesium | Coco on rainwater, filtered or RO. Buy this if you run a CANNA feed. | $50 |
| Green Planet Pro Cal | Readily available calcium and magnesium | The value pick. Also the best one for rust spots and pale new growth at once. | $16 |
| Athena Cal Mag | Calcium, magnesium, iron and nitrogen | Athena feeds, and tight two parts you do not want moved. | $33 |
| Total Horticulture Concentration Cal-Mag | Hardens soft water, stabilises EC | Growers who work off their own EC pen. | $39 |
| Emerald Harvest Cal Mag | Calcium, holds cell walls together | Organic leaning feeds, or dropping a separate kelp bottle. | $33 |
| Advanced Nutrients Sensi Cal-Mag Xtra | Chelated calcium, magnesium and iron | Fixing spots you can already see. | $29 |
How much per litre?
Do I need it in soil?
Can too much lock something out?
Microbes
Cal-mag fixes what the coco takes. A microbe makes the roots reach further for everything else.
See the microbe rangeRoot stimulants
A bigger root system in week one means less deficiency pressure all run.
See root stimulantsSilica
Calcium and silicon both build the cell wall. Most growers fix one and ignore the other.
See the silica rangeFix it this week
Calcium cannot move once it is in a leaf. The damage you are looking at will not come back. All you can change is what grows next.
Happy Hydroponics, 1/35 Gwen Road, Cranbourne West VIC 3977 · Mon to Sat 9:30am to 5:30pm