Humidity sprayer (5 litre)
A 5-litre pressure sprayer for keeping your mushroom house at the right humidity. A mist that stays suspended, which is what mushroom rooms actually need.
KES 1,800 each
A mushroom fruiting room fails more often from humidity than from anything else. The target is a relative humidity above about 85%, and the difference between 70% and 90% is the difference between a good crop and a crop that pinches off and never opens.
It is built for misting a fruiting room: a fine mist rather than a jet, and a tank light enough to carry between bags. Message us on WhatsApp for the current tank material and nozzle type before you buy, since we change stock as suppliers come and go and we would rather tell you the exact spec than guess at it here.
Why a pressure sprayer and not a bottle
The point of misting in a mushroom room is not to wet the surface. It is to raise the humidity of the air. Those are different jobs, and a garden hose or an open pump sprayer puts a lot of water on the bags, which gives you wetness rather than humidity, and eventually gives you bacterial blotch on the mushrooms.
A pressure sprayer throws a fine mist into the air where it hangs. Two or three passes across the room, aimed high rather than at the bags, will raise humidity much faster and put far less water on the crop.
How to use it
- Fill it with clean water and pump to build pressure before you start.
- Stand back and spray high, above the bags, with a fine mist rather than a jet. Walk the room in a slow arc.
- Mist the walls and floor as well as the air. The surfaces are what the air is picking up moisture from.
- Mist early in the day, and keep the room closed for the next few hours so the humidity builds and holds.
- Misting is not the same as a humidifier, and over-misting is a real mistake. If water is beading and running on the bags, you are watering them, not humidifying them.
Check the humidity rather than guessing. A thermo-hygrometer is the cheapest tool in the room, and it turns a guess into a number.
Common mistakes
- Spraying the mushrooms directly. Aim at the air and the ceiling.
- Misting at night and then venting the room. You lose the humidity you just built. Time it to the morning.
- No airflow. Saturated, still air gives you bacterial blotch instead of mushrooms. Misting and fresh air have to be balanced against each other.
- Letting the sprayer run out of suction pressure mid-pass. That is when the coarse droplets appear and you put water on the bags instead of into the air.
Common questions
What humidity do mushrooms need?
Keep the fruiting room above about 85% relative humidity. Below 70% the mushrooms dry out and the caps pinch instead of opening properly.
How often should I mist a mushroom room?
Once or twice a day, in the morning, and keep the room closed for a few hours afterwards so the humidity builds. More than that usually means you are watering the bags rather than humidifying the air.
Should I spray the mushrooms directly?
No. Mist high, into the air, and at the walls and floor. Spraying the crop directly keeps the caps wet, which invites bacterial blotch.
Is 5 litres enough?
For a small fruiting room, yes, and it is light enough to carry between bags. For a large commercial room you will be refilling it several times a session, so contact us before buying and we will tell you honestly what size you actually need.
Do I need a sprayer and a humidifier both?
A sprayer is enough for a small room and is what most first-time growers use. Larger rooms need airflow as well as humidity, and that is where a commercial setup starts costing more than the crops earn.