What is House & Garden Magnesium Mg08% and why do plants need it?
House & Garden Magnesium Mg08% is a concentrated magnesium supplement (8% MgO) used to prevent or correct magnesium deficiency. Magnesium sits at the centre of chlorophyll, so without enough of it, photosynthesis drops, leaves yellow, and growth slows. This product helps keep plants green, efficient, and properly powered through both veg and flower.
What are the main signs of magnesium deficiency?
The classic sign is interveinal chlorosis, where leaf tissue turns yellow but the veins stay green, usually starting on older leaves. You may also see early leaf drop and reduced vigour. Damaged leaves rarely return to perfect green, so improvement is best judged by healthy, greener new growth.
How quickly does Magnesium Mg08% work?
Once magnesium is available and pH is correct, plants usually stop declining fairly quickly. Visual improvement shows up in new growth rather than damaged leaves. If nothing changes, it’s a sign the issue is pH, salt buildup, or root health rather than magnesium supply alone.
Can I use House & Garden Magnesium Mg08% in veg and flower?
Yes. Magnesium Mg08% can be used throughout the entire grow cycle. It’s especially useful during heavy vegetative growth, under strong LED lighting, and in flowering when photosynthesis demand stays high but nutrient balance becomes more sensitive.
Should I use Magnesium Mg08% as a preventative?
Many growers do. Using it at the standard rate helps prevent magnesium deficiency before symptoms appear, particularly in coco, hydro, and LED grows where magnesium demand increases quickly. Preventative use is usually safer than trying to chase a deficiency later.
What dose should I use, and how often?
The standard rate is 0.5 mL per litre of nutrient solution, used with every feed. That equals 5 mL per 10L or 50 mL per 100L. It’s best to stick to this rate and fix underlying issues rather than pushing higher doses.
Which grow media and systems can I use Magnesium Mg08% in?
It’s suitable for soil, coco, hydroponics, DWC/RDWC, autopots, and drip irrigation systems. Just keep reservoirs clean and well‑oxygenated, as root‑zone problems can mimic nutrient deficiencies.
Does House & Garden Magnesium Mg08% affect EC or pH?
Yes, slightly. It adds minerals, so EC/PPM can rise a bit, and pH may shift depending on your water. Always mix your full solution first, check EC, then adjust pH at the end.
What’s the correct mixing order?
Water first, then base nutrients, then House & Garden Magnesium Mg08% and other additives. Mix well between each step, check EC, and adjust pH last. Never mix concentrates directly together.
Can I use Magnesium Mg08% with Cal‑Mag, silica, or PK boosters?
You can, but balance matters. If you’re already running a strong Cal‑Mag, extra magnesium may not be needed and can cause imbalance. Silica should go into water first. With PK boosters, keep EC sensible, as heavy stacking makes nutrient balance harder.
What are signs I’m using too much magnesium?
Plants may stall despite feeding, new imbalance symptoms can appear (often calcium‑like issues), and runoff EC can creep up. If this happens, dial the dose back and check pH and total feed strength.
What if my yellowing isn’t improving after using Magnesium Mg08%?
Check pH first, then runoff EC or salt buildup, and finally root health. Magnesium supplements won’t work if uptake is blocked. Also confirm symptoms actually match magnesium deficiency rather than nitrogen, calcium, or environmental stress.
How should I store House & Garden Magnesium Mg08%, and how long does it last?
Store sealed, cool, and out of direct sunlight, and shake well before use. It’s commonly sold in a 1L bottle, which treats roughly 2,000 litres of nutrient solution at the standard rate, so it lasts a long time for most growers.
