I have a block-paved courtyard. What can I do to remove/prevent: a) algae on blocks; b) moss between blocks?

Answer 1

Try Vinnegar in a spray bottle. The algae might need bleach/water solution and a stiff brush. (3 parts water, 1 part bleach. That's what I use on my roof shingles on the north side/no sun side of house) You can get a 'push broom' at a home-deptot type store with stiff bristles for ease of scrubbing the blocks. . Personally I think the moss is cool and i leave mine, it's soft and cushy. You can put stone dust in between the blocks to prevent things growing, or put in your own little plants to crowd out anything else. there is a line of little plants called 'stepables' with things like little thyme, little succulant plants etc. The moss itself will tend to crowd out weeds like crabgrass!!! good luck!

Answer 2

If the paving has become slippy and dangerous Jeyes Fluid is usually excellent at removing all algae and moss. It now comes in handy sprays, or you can buy a canful and dilute it down with water in a bucket or bowl and use a stiff long handled brush to brush the whole courtyard with it. This will have a strong smell for a few days, but it works very well. Good luck!

Answer 3

Water the whole area (using a fine spray watering can)with a solution of 'Path Clear', which can be purchased from most DIY stores and garden nurseries.

Best done in April when growth restarts. However, this warm winter could bring that date forward. The treatment will be effective for a year. Keep the spray off the flower beds.

Be careful in handling the powder before dissolving. Keep animals off the path until dry. Good Luck!

Answer 4

Sulphate of ammonia is sold as a fertiliser in garden centers, but it is the best natural moss and algie disolver you can buy. A cup full in a gallon of water, disolve, and water on or spray. Weed killers won't work, Also Amilatox can be used, again not on label due to stuip regs, a cap full in 2pints the use as above, this can also be used as a winter tree wash.
The only way to prevent is to move patio to south facing aspect

Answer 5

to remove the moss use a good jet wash.then wait for a good dry day and use a patio seal it brush or roller appliable.or a clear exterior silicon sealant this will make the blocks nonporous giving algae nothing to adhere to it will kill the suction it needs to bond to the surface.then use brush in sand you can get this from a local builders merchants to fill the joints

Answer 6

AND GOOD WEED/BRUSH/GRASS KILLER WILL WORK BETWEEN THE BLOCKS.
ONE PART BLEACH AND 5 PARTS WATER WILL LOSSEN AND REMOVE THE ALGAE. A SCRUB BRUSH TO LOSSEN AND THEN A GARDEN HOSE TO WASH IT OFF

Answer 7

I use Jays fluid as does Blondyand power wash.

Answer 8

i think moss looks cool it gives it the ancient rustic majestic look thats just my opinion but yeah lol

Answer 9

area is too wet, and not enough sun. You could spray it with a fungicide regularly

Answer 10

fungicide or solution of bleach water wash regularly.