Roses can be grown in all kinds of substrates. However it is important to take into account the water capacity, Aera-tion and stability of the structure of the substrate. The structure of organic substrates always changes during growth due to rot. This is easily seen with roses grown in cocos peat in buckets or boxes. The volume shrinks. Be-cause of this process the density of the cocos increases and it will become much wetter. It is important not to wa-ter too long during the afternoon in order to maintain sufficient oxygen in the cocos for the dissimilation process of the roots. This process ensures that enough energy is available for the active nutrient uptake process during evening and night. (Waterings of 800- 1000cc/m2 per time every 60 minutes). There should be about 3-5L of substrate available per plant, to ensure against water-shortage.

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