Peters Excel 15-5-15 CalMag Special is a water-soluble fertilizer built for growers who use rainwater, RO water or heavily flushed media. It supplies calcium and magnesium alongside a high-nitrogen, low-phosphorus, high-potassium ratio, so plants get the calmag they miss when tap water is left out. Orchid growers use it across Cattleya, Catasetinae, Paphiopedilum, Phragmipedium, Phalaenopsis species, potted Bulbophyllum and Dendrobium. Against plain bloom-booster or general-purpose feeds, the draw is the built-in calcium and magnesium; the trade-off is that it is a maintenance feed, not a bloom-forcing formula.
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Buyers rate it highly, with all 18 ratings at five stars. Orchid growers report steady growth and healthy roots when it is used with rainwater or RO water.
Peters Excel 15-5-15 CalMag Special is a water-soluble fertilizer. It supplies calcium and magnesium along with balanced nitrogen and potassium. It suits growers who use rainwater, RO water or well-flushed media.
It is used on Cattleya, Catasetinae, Paphiopedilum, Phragmipedium, Phalaenopsis species, potted Bulbophyllum and Dendrobium.
For sensitive feeders such as Paphs, Phrags and Bulbophyllum, mix ½ teaspoon per gallon every other week. Flush monthly with rain or RO water. For other orchids, mix 1 teaspoon per gallon weekly, and every other week in winter. Flush periodically if you water with tap water.
