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Mark Wittman

Mark Wittman is a passionate agronomist with more than 30 years of experience in commercial growing and 15 years of experience in coconut coir R&D. He's worked around the world, designed many coco manufacturing sites in Asia, and is now a partner at California Substrates where he is focused on designing and providing the best coconut coir to North American Growers.

Articles by Mark Wittman

Making the Case for Shorter, More Frequent Watering Making the Case for Shorter, More Frequent Watering Making the Case for Shorter, More Frequent Watering Making the Case for Shorter, More Frequent Watering


For every new set-up, growers have to work out the details of how much water to provide their plants, and how often it is applied. They...

Understanding EC, TDS and PPM Understanding EC, TDS and PPM Understanding EC, TDS and PPM Understanding EC, TDS and PPM


How EC and TDS are related, and where exactly PPMs fit into the equation of a hydroponic garden.

Buffering Up: Adjusting the Cation Exchange Capacity in Coco Growing Media Buffering Up: Adjusting the Cation Exchange Capacity in Coco Growing Media Buffering Up: Adjusting the Cation Exchange Capacity in Coco Growing Media Buffering Up: Adjusting the Cation Exchange Capacity in Coco Growing Media


The widespread use of calcium and magnesium supplements in the indoor gardening industry is an indication that many growers have discovered...

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