Hello Tim, over time the rubber will begin to break down & leaches chemicals which is a concern, but ive been looking into it for kids play grounds etc & found it insulates the under layer well but can get hot in the sun at the surface so perhaps bulbs wont like that.... You find weeds & grass struggle to live in it, so perhaps bulbs may not like pushing through it too ??? On 11 October 2014 02:42, Tim Eck <teck11@embarqmail.com> wrote: > All, > Has anybody experience using rubber mulch (from used tires) in well drained > mixes for bulbs, orchids, succulents, etc.? It should be lightweight and > inert. > Thanks > Tim > > _______________________________________________ > pbs mailing list > pbs@lists.ibiblio.org > http://pacificbulbsociety.org/list.php > http://pacificbulbsociety.org/pbswiki/ > -- Steven : ) Esk Queensland Australia Summer Zone 5 Winter Zone 10