Pack size 20kg
There are many grades of Ferrous Sulphate, some don't dissolve well and can be very damaging to sprayers. This is a crystaline product and it dissolves in water very well even at low temperatures.
The best dilution for killing moss and for disease control is 5kg (5 litres) in 50 litres of water to cover one croquet lawn (1000 sq metres). 1kg (1 litre) in 10 litres of water in a knapsack sprayer to cover 100 sq metres
Moss can only be killed by contact so it is important to use a lot of water so that it reaches all the plant. See the video - click the Video tab above. The product will stain clothing, paving slabs etc. It is not toxic to pets or humans when used as directed.
Moss produces spores twice a year so should be treated in Spring and Autumn to kill the moss and prevent new spores ripening. Moss doesn’t have a vascular system and the roots have no function except to hold onto the ground, so re-growth is caused by spores in the soil not from roots. The winter feed mentioned above will reduce the moss to some extent but is not as strong as soluble Iron. The grade of iron that I supply dissolves well even in very cold water, is widely used by professionals and works really well. One bag is enough to treat the whole lawn five times so is very cost effective, there are cheaper alternatives but Iron comes in many grades and some can be hard to dissolve and very damaging to sprayers. At the dilution that I recommend it will blacken moss and I usually leave it and let the grass grow through, that way the surface isn’t disrupted. However, you can rake lightly but try not to disturb the rootzone.
Be careful to wash your sprayer out very thoroughly so that no iron is left in the pipes or pump as it will re-crystalise and potentially ruin the sprayer. For spot treatment, a watering can and fine rose can be used.
Red Thread, Dollar Spot and Fusarium
Iron will kill fungus that is on the leaf, before it breaks into the plant. It is a very cost effective method of control and far better for the environment than using a fungicide. If the disease gets into the plant, you are too late and with Dollar Spot and Fusarium, the plant will die. But iron will stop the spread and repeat applications may be necessary. Use the same dilution that I have recommended for moss.
There is no restriction on the use of Iron as a turf "hardener" or "green-up" tonic. At higher concentrations pesticide certification is required.