Moss in the Grass
And ‘Welcome’ to all you Chinese. There are as many people reading articles from there as the UK! It’s TRUE!
So, how do you gardeners rid your lawn of moss? Well, you’ll have to read on to find out!
When life started to emerge from the watery realms it, unexpectedly, was poorly adapted to life on land. Evolution needs time to work its miracle. LOTS of time.
The mosses and liverworts (known as Bryophytes) were the relatives of the algae that made the leap first. Today’s types of bryophytes are very distant relatives of the first terrestrial invaders – and your lawn grass is one of them.
Human sperm and eggs have just a single set of chromosomes – 23 in number. Egg and sperm’s DNA combine to give the two sets, 46 chromosomes, of the normal human.
Mosses (and liverworts) have a similar, but very different, pattern of changes in chromosome numbers. The moss plant you spot in the lawn, growing on a wall or under a woodland canopy has just a single chromosome set. This generates egg or sperm cells which, under WET CONDITIONS, can fuse. However, this zygote (fertilized egg with two chromosome sets) grows in situ on top of the green mossy plant – a spiky, small stem with a bobble (Capsule) on its end. Eventually, this capsule will burst open liberating spores which can grow on your lawn to a new green moss.
Mosses (Liverworts, horsetails and ferns) must have a wet environment at the appropriate time to complete the life cycle. That is not true for conifers or flowering plants … or humans … although a warm beach can be an inducement!
Mosses can never grow big as they contain almost no system for transporting water around the plant … you need to move on to the horsetails and ferns before that happens … which is why they can grow bigger.
The spore capsules contain vast numbers of spores. They are everywhere. On my garden wall these capsules are consumed by goldfinches over the winter. They sit nibbling them off most days.
Mosses do not like really dry conditions – because they cannot reproduce. But, they can survive dehydration for a while, so in the UK are seldom killed off by a hot summer as a wet autumn and winter follows.
Iron sulphate is deadly to mosses. So, lawn sand is a combination of fine sand and iron sulphate. The sand, in theory, carries the iron and lightens the soil. Except, I do not believe the latter unless you add tonnes. Much better to buy the iron sulphate and spread it with a gloved hand. Much cheaper.
BUT, the soil is full of enough moss spores to grow new plants for fifty years. So, sit back, admire the mosses and do not chuck unwanted iron sulphate to pollute the water supply. ‘Going for the mosses’ is a waste of time and effort.