Biological pest control.

[Tindomul]

Thanks Ray. You are correct. I am not doing a thorough job in cleaning the plants. The reason for this is because I cannot remove the plant and many of its pbulbs and roots are not accessible to my large bulky hands.

[quiltergal]

My son works at Nature's Control (the first link D posted). I can ask him if he thinks they really do a good job, and how long it usually takes if you like.