The Verbena bonariensis seeds I spoke of in the last article about stratification, have been planted and refrigerated.  

Using the small square coir pots, I filled with seed starter mix, well dampened and very carefully sprinkled a few seeds on top. A layer of vermiculite was gently placed on top and the pots were then placed in an empty,  plastic ‘mixed greens clam shell’ with the lid on. These clamshells are so useful at this time of year so if you are starting seeds indoors, don’t throw them out!

I also placed some seeds on a damp paper towel and put those in one of the very small plastic clamshell containers used for herbs. I would like to compare the germination rate. I will check both containers periodically over the next month to make sure they don’t dry out. I should mention I have had success in the past, just by placing the dry seed package in the fridge for a time before sowing. I don’t believe the success rate is so high that way however.  Another method of cold stratification is to mix an amount of the seed with sand or compost that has been dampened and seal in a plastic bag . The bags will also be placed in the refrigerator. Should seeds germinate while in their cold location, they can be brought out and allowed to grow in a frost sheltered location until sufficient size to be planted out. In the case of those seeds on paper towel, they will need to be placed on some seed mix to allow roots to develop. The seedlings will need to be transplanted into bigger posts before planting out. Don’t forget to label all your seeds every time you sow or transplant. Popsicle sticks work well. It is so easy for seedlings to get mixed up!

The vermiculate placed on the top of the soil surface serves a purpose. Vermiculate is a form of mica extracted from rocks. It is heated, which makes it expand considerably and the small pieces that we buy are made up of layers that expanded under heat. The layers hold water ensuring small seedlings don’t dry out. Vermiculite is also a valuable soil enhancer for assisting in the retention of water, which is why it is frequently included in potting mixes. When you buy a bag of vermiculite you will notice for the volume, it is extremely light.

Many wildflowers require cold stratification before being seeded outside. The seeds were harvested in the fall, packaged and kept in a storeroom until marketed for sale. Therefore they never received their required cold period. Always carefully read the seed package to see if your seeds require this process. It is such an easy thing to do to avoid the disappointment of poor germination.

The tiny seed of Verbena bonariensis surrounded by tiny pieces of chaf that surrounded the seed on the plant.