It sounds like dodder, a parasitic weed that feeds off nutrients meant for your basil. Remove it as well as the portion of basil to which it is attached. Unfortunately, is very persistent. If it has flowered and gone to seed, you may be fighting it for a few seasons.
It sounds like dodder, a parasitic weed that feeds off nutrients meant for your basil. Remove it as well as the portion of basil to which it is attached. Unfortunately, is very persistent. If it has flowered and gone to seed, you may be fighting it for a few seasons.