CANNA Substra Flores A+B 2x1L Canna Substra Flores A+B 2x1L ANNA Substra is one of the cornerstones that have helped CANNA to become world market leader CANNA Substra has a balanced quantity of all nutritional elements needed by plants. As the substrates used in run-to-waste systems are mostly inert (They dont add or take nutrient elements from the nutrient solution) all the nutrients have to be in the nutrient solution. An excess of nutritional elements can lead to plant damage but they will also end up in the environment.