There are several invasive species of knapweed, and most tolerate and even thrive in very dry conditions, but spotted knapweed survives in higher moisture areas as well.
(most; tolerate; ) (most; even thrive; L:in very dry conditions) (spotted knapweed; survives; L:in higher moisture areas; as well)
most most spotted knapweed
tolerate even thrive survives
L:in very dry conditions
L:in higher moisture areas as well