I assume (I know what happens when I assume) that most people who grow bulbs in pots add fertilizer at one time or another. “The benefits of mycorrhizae are greatest when soil phosphorus levels are at or below 50 ppm (50 mg kg -1). Mycorrhizal infection of roots declines above this level with little if any infection occurring above 100 ppm P even when soil is inoculated with a mycorrhizae mix.” http://mining.state.co.us/SiteCollectionDocuments/… Bob Nold Denver, Colorado, USA _______________________________________________ pbs mailing list pbs@lists.ibiblio.org http://pacificbulbsociety.org/list.php http://pacificbulbsociety.org/pbswiki/