On 1 Nov 2010, sprayed young weeds on beds B1, B4-6 with 30% acetic acid. Sprayed some cheeseweed and pigweed with the acetic acid also. Also sprayed a patch of filaree seedlings in the rocky parking area with 1:3 household ammonia:water. Also used that mixture to soak a few yellow starthistles and cheeseweeds. The ammonia will either help them or hurt them...not sure which.