Sowing Seeds In Winter

People who have been sowing perennial or tree or shrub seeds are probably familiar with the term "stratification" which means simulating winter conditions in order to make seeds sprout. Many plants originating from colder climate produce seeds that don't sprout before they have experienced a winter period.

Last winter I had my fridge full of seed pots. As the stratification process is not the same for all the seeds, I had pots with labels explaining how long they were supposed to be kept in cool. I suppose most people just have small plastic bags with moist sand and seeds in the fridge if they intend to have anything stratified, but I had both bags and pots and I have to admit I had better success with pots.

Last winter I acquired lots of perennial and tree seeds that needed stratification, and since I ran out of space, I decided to simply sow some seeds in pots and place them outdoors. There was winter there behind the front door, you see, to be taken advantage of. I didn't just place the pots outside without any protection, but dug a hole in the snow and put each pot in their own hole, then covering them with a good amount of snow again.

This winter I'm having my fridge full of bulbs and rhizomes, so I don't have any space there. I have some Dahlias overwintering there and I just bought some new bulbs from the local hardware store. Since it's not spring yet, I have to keep them in cool before planting them out in May.

I'm not planning to sow lots of seeds indoors this year, actually I'm trying to avoid it completely. But since I collected some rose seeds and crabapple seeds last autumn, I had to sow some of them. I'm not sure if they are viable though, because these seeds I didn't store exactly the way the should be stored... I  have to confess that I forgot those little apples and rose hips on a plate in a drawer and they completely dried out before harvesting the seeds! So I may have been sowing something that's never going to sprout no matter what I do.

Here the ever optimistic me has been sowing some seeds of Rosa 'Juhannusmorsian' and Malus purpurea 'Kadetti'. The pot is waiting to be placed in the snow.

Here is a hole I dug for the pot. 

As you can see, I have been doing a good job: the pot fits perfectly.

And here it is. You would never guess there's a pot with seeds beneath the snow, would you? 

The weather has been very mild now, it was about -1 °C when I did this. But last year I did the same at -25 °C and it didn't seem to make much difference, as those seeds sprouted. I guess the thick layer of snow (last winter was very snowy) protected the seeds well enough.

I'm not saying this is a proved way to make the seeds sprout, but I did this with several different seeds last winter, and it worked for some. Then again, I never saw some sprouting at all, but that was the result with some of the seeds I tried stratifying in the fridge as well. I probably did something wrong with them, or they were some very old seed stock with no viability at all. (I would like to think the latter, but the first is more likely to be true.) Those that didn't sprout last spring, I left outdoors for the whole summer. Some rose and magnolia seeds sprouted late in the summer. As some pots had nothing sprouting by the time autumn arrived, I just left them outside for their second winter. Let's see if that'll do the trick or if I will give up on them when summer comes.