To protect cacti from the heat in summer and prevent their overheating and rotting, several methods can be applied:

Placement in partial shade: Place the cacti where they will receive only diffused light or stretch a net over them if they are outdoors and it is not possible to provide cover over them (polycarbonate). Use the shade from other plants, a 30-40% shade net, or a special canopy.

Watering regulation: Reduce the frequency of watering but increase the amount of water at each watering. It is important that the soil completely dries out between waterings to avoid root rot.

Ventilation: Ensure good air circulation around the plants. This can be done by placing the cacti on a balcony or in a well-ventilated room. In our greenhouses, we installed fans (5-10 medium fans per 100-200 square meters of the greenhouse).

Using light substrate: The soil should be light and well-drained to prevent water from stagnating at the roots. You can use a cactus mix by adding sand or perlite.

Substrate for mulching: Mulch the surface of the soil with coarse gravel or small stones. This will help retain moisture and lower the soil temperature.

Spraying: On particularly hot days in the evening, after sunset, you can lightly spray the cacti with water to reduce their surface temperature, but do not overdo it to avoid causing rot.

Temperature control: If the cacti are indoors, monitor the air temperature, keeping it within 25-30 degrees Celsius.

Following these recommendations will help your cacti survive the hot summer without damage.