Monday, May 08, 2006

 

Fertilizing the Cactus.




All mature actively growing cacti need to be fed occasionally. It is best to use a formula specifically designed for cactus like 7-40-6. (Nitrogen, phosphorus, potash) Use a mixture with a low ratio of nitrogen, as cacti can be burned by it. A commercial formula such as miracle grow or rapid grow can be used, but should be diluted to half strength. I have heard that "cactus juice" brand by Sudbury (1-7-6), is highly recommended. Regular Bone Meal, available at most Garden Centers, makes an excellent organic fertilizer. Don't forget the macro-nutrients like Iron (Fe), Calcium (Ca), Sulfur (S), and Magnesium (Mg). Also important are the micro-nutrients Copper (Cu), Zinc (Zn), and Manganese (Mn).

San Pedro especially, does very well indoors behind glass. A location where the plant gets at least 4 hours a day of bright, direct sunlight is ideal. The best possible situation would be a South facing sliding glass door, and a reflective screen placed behind the Cactus to redirect and concentrate the light.

Many Cacti have beautiful and fragrant flowers, but they can be quite hard to get to bloom. The optimal conditions to induce flowering are, a cooler temperature (especially at night), reduced day length (12 hours or less), and variations in nutrients (lower nitrogen levels). Try putting your Cactus in a dark, unheated garage (not below freezing) for a few weeks. Forcing can also be done inside, but you need a place next to lots of glass that stays cooler than the rest of the house.


# posted by Adv. Blogger @ 4:46 AM
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