When watering succulent arrangements or cacti in pots without drainage, the most important thing to bear in mind is to apply water in a controlled manner and to allow the soil to dry out in between waterings.
We generally prefer to use a directional spray bottle with the nozzle set on the stream setting. Aim the water stream around the base of the succulent and on the top of the soil or gravel. Apply just enough water so that roots can soak up moisture but not so much that the roots would be sitting in water.
To clarify, we are not recommending to spritz or spray your plants. Spraying or misting the succulent or cacti plant is not helping your plant in any way, the objective is to direct the water towards the base of the plant where the roots can take up the water they require.
As a general rule of thumb, we recommend once a fortnight watering cycle for succulents and once a month for cacti. These recommendations can vary depending on the sunlight received and pot depth. More sun and a shallower pot may require increased frequency where as a deeper pot and lower light situation would require you water less often. The main key is not to over-water. Please adjust according to your plants environs.
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