How do I kill lichen growing in between my patio block paving?
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Boiling water is cheap and effective
A good pressure washing should get rid if them. Aim the stream to get them to lift and separate from the paver. DO NOT USE BLEACH...is doesn't work and can cause harm to the area around the pavers.
Prevention is the harder part as they love moisture. Keeping leave and plant debris off the area helps...but direct sun to the area is the best prevention, but not always feasible.
I am guessing this might be moss, not lichen. Lichen is the smallest plant growth that we can see, and doesn't "lift or separate" as mentioned. But googling both will give you photos and advice to remove them.
Have you tried vinegar? Mix 2 parts vinegar with 1 part water, and spray, then leave on. It may need a couple of applications.
Then use a stiff brush, or power hose. Afterwards, you'll probably need to reapply now and then because of new spores that naturally blow in the wind, as they'll settle in where the environment is favorable and try to take hold again.
You do not say how much you are talking about so the scope of your problem will determine how large a container of solution you will need to use.
I would just keep a spray bottle filled with white vinegar and spray it (hot sun helps vinegar work faster) occasionally. This will kill it and how unsightly the dead looks will determine if you have to do anything about removing it. You can take a good broom and sweep some of the dead away and gradually remove all of it.
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