The support (1) for the plants (4) is formed by a block of a material with a high capillary action, for instance porous coral, with capillary spaces which are mutually connected. The capillary spaces form the storage medium for water for feeding the plants. The block is shaped so that the recess for each plant (2) is formed in a mass of material which is sufficient to assure the feeding of water to the plants by capillary action. The planar recesses are shaped to assure a sufficient mass of block material around the plants for a reliable supply of water.
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