Poet, Phillip Pulfrey said it best:
I learn more about God
From weeds than from roses;
Through the smallest chink of hope
In the absolute of concrete….
My intimate relationship with this forage-weed is a lot like a marriage, it takes patience and compromise to work. Many folks abhor this matrimony and seek divorce by lethal injection with chemicals. I’m too darn stubborn to take this easy, costly route for I have an appreciation or affliction in working with this plant as a symbol of diversity and importance. In my way of thinking, God gave us this plant for a reason and I’m determined to find out why.
According to the late Newman Turner, this “herb” knapweed or hardheads, as he called them, is one of the few indicators of phosphate deficiency. He said, “The existence of knapweed is one of the few justifications for applying rock phosphate as well as manure and ground limestone.” Curious to me was his description of how far down the plant’s roots will go to tap subsoil phosphorus and thrive when other plants won’t. Since I have low phosphorus on many fields because of no grain importation or added soil amendments, this makes sense to me.
Ok, so it’s evident I have a problem. In addition to fertility, I have out-wintered on fields, scarring them up and compacting them which gives way to plants that can fill the void and have rolled out bales with knapweed plants in them. My friend Nathan also thinks the severe drought with long pasture recovery periods and the die back of other pasture species from last year is helping with the proliferation problem. I’m sure it’s a combination of many factors.
The bigger question is what to do or not do against our holistic farm goals which direct us to like diversity, soil biology, water quality and wildlife. Can bigger picture thinking and land management be the right tools? I’m convinced if you study and observe the subtleties of nature, you’ll find the solution.
If you can accept the spotted, Russian or whatever knapweed species you have will always be around in some fashion depending on conditions, I think you can move forward in controlling the forage plant. Ian Mitchell-Innes coaxed me to move towards what I want by planning my grazing. He also liked that we have the most overlooked weed killer, frost and snow. I took this knowledge to heart.
1) Teach your animals to eat it by learning animal behavior from Kathy Voth’s training regime.
2) Plan to graze an infested field when the plants are young and tender(4-6”) while getting enough animal impact to eat every plant or trample them.
3) Manure heavily or add compost or soil amendments so other plants out compete the weeds.
4) Graze more frequently avoiding long recovery periods >40 days and clip after each grazing period.
5) If the knapweed gets ahead of you, have the patience to let it flower (allowing bees to make you some awesome honey and grassland birds to nest) and then turn animals in to eat the blossoms and top leaves thereby stealing the plants ability to seed.
It’s number 5 that has me most interested. I’m not too old to forget the Bambi movie when Thumper the bunny rabbit was scolded by his mom for just eating the blossoms and came up with this famous quote, “Eating greens is a special treat, it makes long ears and great big feet. But it sure is awful stuff to eat.”
After witnessing the cows eating all the purple flowers and the top leaves when turned into a paddock, I decided to do a brix test on the plant. Turns out Thumper was right, the brix was twice that of the other plants in the field. I took it even further. I harvested them and sent them into the Dairy One Forage Lab. The technicians must have been scratching their heads as they tested them. In Jerry Brunetti’s honor, the sample (attached) came back indicating the plant parts were as good as pre-bud alfalfa with an excellent mineral profile. This was good stuff! Why would we want to kill it?
With the plant tops bitten off here in July and August, I went ahead and clipped the paddocks down so I would have quality stockpiled forage for fall and winter grazing before our frost in the first part of October. Taking a cue from Newman Turner’s chapter on making an herbal ley with a mower this now awesome forage-weed that sucked up phosphorus from the subsoil is chopped up and returned back to the soil biology to fertilize the growing sward. Cycle complete!
My long view of this purple knapweed problem and solution manifested itself while I was lingering in a field filled with busy pollinators. How would my decision effect more than me as the workers of humanity harvested pollen? Shouldn’t we weigh the control options very carefully because we have the ability to think with this big brain cell of ours?
I’m convinced if you work with nature on the same plane, you’ll find the answers you need. But it might take alittle nap to get you prepared for a change in mindset.