To exclude invasive roots, I lined my raised beds with heavy-duty woven groundcloth (the kind used in nurseries, not what they sell in garden centers). Water passes through it. Like redwoods, the Pacific native "red cedar" (Thuja plicata, not a cedar, nor what they call "cedar" in the east) has endless moisture-seeking roots. Such trees can be helpful with a bulb collection in that they reduce summer moisture. Jane McGary, Portland, Oregon, USA On 8/28/2022 5:26 PM, John Wickham via pbs wrote: > I fear the nearby Zauchneria, which has formed dense mats under the nearby shrubs. The California bulbs may appreciate that companionship, though. > Fascinating to hear about redwood roots. > > On Sunday, August 28, 2022 at 04:41:32 PM PDT, Robert Parks via pbs <pbs@lists.pacificbulbsociety.net> wrote: > > Wow! Redwoods are crafty, so far the only thing that has been invading pots > are Psoralea roots (Koolaid Bush)...the last thing I needed when lifting > pots of miniature Oxalis with bulbs similar in size to the nitrogen fixing > nodules on the tree roots. > _______________________________________________ pbs mailing list pbs@lists.pacificbulbsociety.net http://lists.pacificbulbsociety.net/cgi-bin/… Unsubscribe: <mailto:pbs-unsubscribe@lists.pacificbulbsociety.net> PBS Forum https://…