Well, I've finally broke down and got some pasture pro and went out with my backpack sprayer (I must be crazy) and spot treated the bull nettle. In order to even make a 'dent' in the nettle, I had to up the concentration to 2%. Then I had to spray it 2-3 times. Needless to say, I'm exhausted, and I've only done the one large pasture.
I plan to wait to see how much died tomorrow and then mow and harrow up the dead weeds. I am putting my horses on the smaller pasture for about a week as it is supposed to rain several times this week.
Will that be enough time to wait to put them back on (1 week after several heavy rains)?
Also, does anyone use something that works better on bull nettle? This weed is crazy annoying!