Mannacote Decoded: What “Up to 6 Months” Really Means on the Flower Long-Term Fertiliser 1 kg
The Manna Cote Flower Long-Term Fertiliser 1 kg is a polymer-coated, controlled-release feed NPK (Mg) 18-8-10 (+2) with trace nutrients, applied at 4-5 g per litre of soil, that feeds for up to 6 months. One 1 kg bucket treats roughly 200 to 250 litres of compost. That’s about four to six large patio pots for a season. The “6 months” is a warm-weather ceiling, not a fixed timer and that’s the part that makes it behave nothing like a liquid feed.
It comes from Hauert MANNA, a Swiss plant-care company with a long heritage in the trade, and the product is sold as small coated spheres rather than powder. That detail matters more than it sounds.
What It’s Built For & What It’ll Let You Down On
It’s made for plant-once-and-leave-it. The listing pitches it for flower boxes, bowls, pots, beds, grave plantings, and lasting plantings like bed and shrub roses, shrubs and trees. Good in that lane.
Where it’ll disappoint you is anything fast and greedy. A heavy-cropping tomato in full fruit, or any plant you want to push hard in a three-week window, won’t get the quick nitrogen hit it’s after the slow diffusion that makes Mannacote brilliant for a season-long box is exactly what makes it too gentle there. For those, use it as the base layer and top up with something fast, not as the whole plan.
The Coating is The Product, Not the NPK
You see, the nutrition ratio on the front is not really what you’re paying for. Plenty of feeds carry an 18-8-10. What makes this one long-term is the shell around every granule, and how that shell decides when to let go.
Water does the work, not a clock. Water soaks through the coating, the fertiliser inside dissolves, and the nutrients diffuse out slowly a steady drip instead of the spike a normal feed throws. And here’s the bit that matters in a real pot: the shell reacts to heat. At higher summer temperatures the nutrients release faster; when it’s cold, the release slows right down, so the feed roughly tracks what the plant actually wants through the year.
That’s why a Mannacote-fed flower box holds colour instead of lurching. Green for a fortnight after a liquid feed, hungry again three weeks later this skips that.
How Much You Actually Need (The Maths Nobody Prints)
The dosage on the bucket is honest but useless on its own. Four to five grams per litre of soil, in a 1 kg bucket. Nobody thinks in litres of soil standing over a pot.
- A standard 10-litre patio pot wants about 40-50 g a rounded handful.
- A 1 kg bucket covers near 200 to 250 litres of media. Call it four to six big pots a season.
- For balcony boxes the German label is stricter: 10 g per plant, sprinkled on after planting.
Mix it into the compost at potting. This isn’t just tidiness there’s research behind it. A PLOS One trial on polymer-coated fertilisers found the beads released their nitrogen close to schedule when worked into the soil, but dumped it within about 35 days when left on the surface. Scatter it on top and you’ve turned a six-month feed into a five-week one.
A long-term feed only works where the roots and the water are. Buried in the root zone it does its job. Sitting on top, it’s decoration and now there’s a study saying so.
“Up to Six Months” & Why You’ll See Twelve Floating Around
Up to 6 months. You’ll also find blogs claiming up to 12 months, and that number isn’t on the manufacturer’s own listing anywhere I could find it. Six is the figure you can stand behind. Twelve is someone’s optimistic copy.
“Up to” is doing heavy lifting there, though. A south-facing pot you water every day in July will burn through the beads faster than the label suggests closer to three or four months. Something shaded and cool will stretch nearer the full six. It’s a ceiling under average conditions, not a date you can circle on a calendar.
References
- Manna Cote Flower Long-Term Fertiliser 1 kg – Amazon.co.uk listing.
- Manna Cote Flower Long-Term Fertiliser 1 kg – Amazon.de listing.
- MANNA Cote Flower Long-Term Fertiliser (NPK 18-8-10 +2) – eBay retail listing.
- Nitrogen release rates from slow- and controlled-release fertilizers influenced by placement and temperature – PLOS One, 2020.