Cattleya velutinas

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Many thanks.I love this sp., for a long time i had no success with them.Now i grow them in pot, i use 25 mm nz bark as media, i give them 500 uS peters , every waterings, rain water+peters with ca/mg, in spring 3:1:1 shifting ratio to 1:1:1 till fall.In winter time i water my catts only once per month.Humidity is high, around 80%, light level is 30-35 000 lux , 14 hours/day.
 
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Many thanks.I love this sp., for a long time i had no success with them.Now i grow them in pot, i use 25 mm nz bark as media, i give them 500 uS peters , every waterings, rain water+peters with ca/mg, in spring 3:1:1 shifting ratio to 1:1:1 till fall.In winter time i water my catts only once per month.Humidity is high, around 80%, light level is 30-35 000 lux , 14 hours/day.

Are the Peters : Ca : Mg ratios expressed in weight and not in volume? Are the two salts used to provide Ca and Mg in effect Calcium Nitrate and Magnesium Sulphate respectively?
 

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