Hi. We planted some Golden Bamboo and have dug a trench surrounding it to a depth of 12". We are not installing a rhizome barrier, but instead planned to just cut the rhizomes as they appear in the trench. We planned to fill in the trench with sand, but have not gotten around to this task yet and the trenches are empty.
In the past few weeks, many rhizomes have entered the trench and we actually found some that had grown completely across the trench and into the lawn. We are distressed by this rate of rhizome growth, which is much faster than we had anticipated. Here is the question, which may be foolish to people expert in bamboo, but is critical for us in deciding whether or not this situation is tenable for us. We are kind of freaking out, thinking we will spend the greater parts of our summers and falls digging these rhizomes out of the ground! But now I am reading in a few places on the net that it is not necessary to remove the rhizome from the ground (the parts that make their way across the trench), it is only necessary to sever them.
SO: which way is it? Do we ned to trim these rhizomes on a weekly basis BEFORE they make their way across the trench(and into the lawn), or is it okay for them to grow this way for weeks and months, and as long as we sever them in the trench at some point in time each season the part that has traveled to the lawn can remain in the ground?
I hope this question makes sense. We cannot spend our lives digging up rhizomes, and it seems these things are going to be really happy where we have sited them!!
Thank you for your time.