How many acorns will survive and become mature oaks? Even if none survive, the project will not be a failure, but a success, because the land had someone caring for its future.
There is a multitude of 100 year-old bur oaks in Evergreen Park near my home. However, there are no seedlings that will take the place of these old oaks when they are blown down or die from oak wilt. So what will this park look like in 50 to 100 years when the oaks die out? Buckthorn, box elder and green ash are not valued replacements to the majestic bur and red oak.
When I look around my neighborhood it is easy to see that this was originally a bur oak savannah. However, many of my neighbors, including myself, have not honored the land. We have planted lawns, where there was once a forest floor; we mow down seedling oaks; we rake up the leaves that would normally breakdown and feed the forest; we plant trees that don’t belong in a bur oak forest, like white pine and spruce.
What to do?
Acorns to Oaks
About 3 weeks ago the bur oak acorns began to drop (Aug. 15). On Sept 14, the red oaks acorns were falling like rain. Red oak acorns take two years to develop on the tree, while white and bur oak acorns take only one year to develop.
White or bur oak acorns should be planted within a week of dropping or kept in the refrigerator, until planted. The red oak acorns need a period of cold storage, called stratification. They may be placed in a plastic bag and left at a temperature slightly above freezing for a period of 4-8 weeks. They can be planted the following spring.
I selected the largest dark acorns I could find. If they had insect holes from acorn weevil larva or were cracked, I did not use them.
To determine whether the acorns were viable, I put them in a bucket of water for 15 minutes. The ones that floated, I scooped out because they were hollow and would not sprout. The sinkers were
the ones I kept for planting. I did this for 3 days and each day there were a few more acorns that floated. There were some acorn weevil larvae which had come out some of the acorns and were laying in the bucket.
Every day, I fill my pockets with acorns and wander around my property or in the park and dig them into the ground about 2-3 inches deep. I think I have planted over a thousand so far, but I stopped counting at 50. If I see a small buckthorn, I’ll pull it up and pop an acorn in the hole. Next year when the seedlings develop leaves, I am going to have to find a way to protect them from rabbits and deer. I am thinking chicken wire tubes might be the way to go.
I wanted to find out how many acorns were infested with weevil larvae. I collected 100 acorns to determine what percent of the acorns were infested with weevil larvae and will not sprout. After three days, only five acorns floated (so 95% of the acorns were capable of sprouting).
Of the 1000 acorns I have planted, how many of those will survive one year. 5% may survive (some quick math – 1000 x 5% = 1000 x .05 = 50 oaks). Even if none survive to maturity, the project will not be a failure, but a success, because the land will have had someone caring for its future.
Teacher and homeschoolers
There is a Utube video called the “man who planted trees” www.youtube.com/watch?v=PYlsIZXCQa4
The book, The Man Who Planted Trees I found inspiring. I have also seen it for sale at Amazon. Also I have seen it on-line for free without the illustrations.
If you want to learn how to identify, age, and determine the height of trees get a copy of Nature Seeker Workbook at the Old Naturalist website or Amazon.com.
In addition, you can Google “planting acorns” and read about the projects that other classes have done.
If you want to plant in a park, work with your city forester or natural resources manager and develop a plan for your project.
Today is October 5th and I planted my last acorn today. I have been planting 3 handfuls of acorns most every day since Aug. 15, when the bur oak acorns started falling. It is amazing what a person can learn from nature if they just connect and interact with it. After planting about 500 acorns randomly, I realized they might grow better if I planted near blow-downs or openings in the forest. I learned about the uniqueness and beauty of the bur oak, red oak, and white oak acorns.