It's not inexpensive (but goes a long way), but I've also found Great White mycorrhizae to be effective in pots. Mike Z7, western WA On Sun, Feb 19, 2017 at 9:58 PM, Diane Whitehead <ldiane.whitehead@gmail.com > wrote: > A non-member has suggested this: > > Also available in powder form to add when watering. Great White is the > one I'm using to good effect. > > > > On 2017-02-18, at 5:55 PM, Tim Eck wrote: > > > You could try a potting medium with mycorrhizae and biofungicide. They > can > > make a difference. > > > > _______________________________________________ > pbs mailing list > pbs@lists.ibiblio.org > http://pacificbulbsociety.org/list.php > http://pacificbulbsociety.org/pbswiki/ >