Stratifying Seeds (I Hope)

I took a break from the blog last week because it was New Year's, and in the wake of the Christmas holiday there was nothing much to talk about. I hope that most were able to enjoy a little time off with friends and family.

We are in the heart of winter now, but it's still time for me to begin the preparations for new plants in the spring. I wrote in previous posts that in the fall I collected some seeds from the wild and from plants in the garden. Many of those seeds have to be properly prepared if I am going to sow them for growing this year.

Separating milkweed seeds from the fluff

When we buy packets of seeds from the store or online, they are usually properly prepared and ready to be planted right away. However, the seeds of many plants, especially perennials, have to go through a winter's cold before they are willing to germinate in the spring. This is a protective measure so that seeds do not drop in the fall and begin to sprout, only to be killed by freezing temperatures.

Because I collected these seeds rather than leaving them in the dirt outside, I will need to give them a simulated winter inside before I can use them in the spring. This process is called stratification. this is something I have never tried before and I am hoping that it works, giving me productive seeds to start a little later this year.

Milkweed seeds ready for a cold treatment

To stratify the seeds, I needed some kind of medium to hold them during the process. Many experts have recommended a variety of options including vermiculite, perlite, and sand. I have chosen fine peat moss, made from decomposed sphagnum. I purchased it from a garden store, so it is sterile, meaning that it should be free from diseases and unwanted seeds from weeds.

Peat Moss

I took a bit of peat moss from the sealed packaging and added some water in a bowl. I then nestled the seeds in the dampened moss. Dampening the moss is supposed to allow the seeds to absorb some moisture, helping prepare them for eventual germination.

I put each bunch of seeds into small plastic resealable bags. After a few days at room temperature to encourage the seeds to take up some moisture, I put those bags in the refrigerator. I chose the bottom drawer of the refrigerator because that tends to be the coldest place without freezing.

I am currently stratifying for different species: Common Milkweed, Butterfly Weed, Jimson Weed, and Common Mullein. Stratification times can vary widely for different types of seeds, but for these particular species I think that about a month will be enough time in the cooler. 

I am very hopeful that this process will yield positive results come spring. If it does not work out though, it was at least an interesting learning experience.

Milkweed Seeds

I have been doing a bit more seed collecting recently, so I thought I would talk about two plants in the same family that I have collected, one from the garden and one from the wild.

This spring, I added Butterfly Weed to the garden. Sometimes called Pleurisy Root, it is a native perennial plant in Maryland. It is more commonly seen in ornamental gardens for the appeal of its clustered orange flowers that appear in the late summer. As the name suggests, Butterfly Weed can be very attractive to various species of butterflies, including the Monarch.

The root of Butterfly Weed was used commonly by native peoples as a medicine. It was quickly adopted by white settlers and continued to serve medicinally through the 19th century. During the Civil War, the Confederate States Medical Purveyors listed Butterfly Weed as part of it's official pharmacopeia. The confederate government paid civilians to harvest the roots for use in the Southern army.

Butterfly Weed was most commonly used to treat a variety of respiratory/pulmonary ailments, including consumption (tuberculosis), pneumonia, bronchitis, and pleurisy (a painful inflammation of membranes between the lungs and chest wall). It was thought to relieve pain and inflammation and act as an expectorant. Butterfly Weed was also sometimes prescribed as a treatment for a host of unrelated conditions ranging from colds and fevers to rheumatism and venereal diseases. I have no idea if it actually worked.

The Butterfly Weed that I planted this year did not fare terribly, but it did not flourish either. I believe that this is because of soil conditions. This plant prefers to grow in gravely or sandy soils and that is not what I had given it. Perhaps I will replant it in a more appropriate soil come spring. One of the plants did do well enough, however, to produce healthy-looking seeds, which I have collected. I am going to try planting these in the spring to produce enough Butterfly Weed that I can begin harvesting some of the roots for future educational programming.

While visiting a pasture in southern Pennsylvania recently, I collected seeds from a close relative of Butterfly Weed: Common Milkweed. Both plants are members of the genus Asclepias. The genus is named for the Greek god of healing.

Asclepius, holding his snake-entwined staff

Milkweed is also a native perennial plant that is very attractive to Monarchs and other butterflies, but it's appearance is a bit different and less attractive to flower gardeners. Milkweed also likes to grow in gravely or sandy soil.

It's root was used to treat a variety of complaints. Like Butterfly Weed, it was believed efficacious in treating respiratory conditions like asthma and bronchitis, but also indigestion, diarrhea, kidney problems, menstrual cramping, dropsy (edema: swelling caused fluid retention), and other surprising ailments. Once again, I have no idea if there is any merit to these prescriptions.

Both types of seeds will require cold treatment, or stratification, to allow them to germinate when I plant them in the spring. That's another blog post!

It looks like our museum mascot Lacey was playing with my camera while I wasn't looking!