The Plant Clinic provides a place and time for people to bring in samples of plants for diagnosis including weeds for identification.
Bring a fresh sample of the weed, plant, insect, etc., that you’d like diagnosed to the clinic. This may include a plant stem with several leaves, a 4-inch square of grass with roots attached, etc. You also may bring a sample of soil for pH testing.
Here’s how to collect a soil sample.
Collect a composite soil sample by removing sub-samples from ten to fifteen small holes dug throughout the sample area (e.g. the front yard). To obtain the sub-samples, carefully pull back mulch, grass or ground covers to expose bare soil. With a hand trowel or shovel, dig small holes six inches deep and then remove a one inch thick by six inch deep slice of soil. Combine and mix the sub-samples in a clean plastic bucket. Place about two cups of this mixture in a plastic bag or small throwaway plastic container. Close the container. If the soil is wet, let it air dry by spreading it out on newspaper before putting it in the container. Make sure to attach a slip of paper with your name, phone number and where the sample was taken (e.g. lawn, vegetable garden, flowerbed, etc.).