Check for the five growing factors: Light, temperature, nutrients, moisture, humidity and arrange for them to be ideal.
Do you grow tropical houseplants? Put them on trays of wet gravel and group them together to create a humid microclimate!
Care for your houseplants: most need humidity to thrive! How to ensure the right humidity level: http://j.mp/eDrFOA
Stand houseplants on trays of damp gravel to counteract drop in humidity in centrally-heated homes.
Stand tropical houseplants on trays of wet gravel to counteract the drop in humidity when the central-heating comes on.