I decided to try a few different methods for seed germination and seedling growing this year to decide the methods that I like best. I thought I would share my findings and progress with you all in hopes that someone else might find it helpful...and also give me a chance to get some advice along the way.
Starting with stratification. I put about 400 seeds in moist vermiculite or a moist paper towel and put them in my fridge on April 15. I moistened both types with water with peroxide added in. I wanted to see the difference between the paper towel and vermiculite. What I found was that, as long as they stayed in the fridge both the paper towel and vermiculite seemed fine. Some of the seeds started to get the little root nubs in the vermiculite but none of the seeds in paper towels did that. I took a few bags out a little earlier than the recommended 4 weeks just to see what would happen. I got some germination in the vermiculite, but 2 of the 3 bags of seeds in moist paper towels got VERY moldy...
I think that I prefer using vermiculite to paper towels for this reason. However, I am finding it hard to look through the seeds to find which ones are ready to plant because they blend in to the vermiculite. Next year I will try to perlite to see if it is as effective as the vermiculite but easier to see the seeds in.
I took the stratified seeds out of the fridge on May 15. I put the ones that were in paper towels into vermiculite so I wouldn't risk molding all of my seeds. I also put about 375 seeds in moist vermiculite or paper towels on May 15 and didn't refrigerate them...I want to see if there is more uniform germination after 4 weeks of moist stratification vs. no stratification. I bagged up each cross and put them in boxes...
I have been moving the boxes around a bit. I have had them in my closet (dark and warm) for some of the time and then in a sunny window area some of the time. In the 11 days since setting out the seeds, I haven't noticed that there is a big difference in the number of seeds that are germinating based on whether they had the four weeks of cold stratification or not. As of now, only around 350 of my almost 800 seeds have germinated. Is this normal? Should I keep the boxes of seeds in a particular spot for better germination rates? If I haven't seen germination by now, it is likely I will?
For those seeds that have germinated...I had planned on putting them all outside in seed trays and then plant them in their seedling bed late August/early September. Well...I put the first few outside and scorched them.
We have also been having strange weather here, so I'm not sure how well outdoor growing will work. I went to Walmart and got the stuff to set up at least a small indoor grow area...enough room to grow four 72 cell flats. So I put some of my germinated seeds inside under lights (I have two 2-light fixtures, each with a daylight and cool white T8 bulb) and some outside in a small 4-shelf greenhouse that I can open when it is warm and close when it is cold or rainy. I am keeping the greenhouse/shelf in the shade for now (I was advised to keep them in the shade for around 2 weeks and then gradually put them in the sun). Here is what they look like after a week...
Indoor under lights...
Outside (you can see the scorched ones in the back
)
The ones indoors definitely look better and I have had better growth rate. I only planted seeds that at least had the radicle showing, but many had a small shoot already as well. However, in the indoor trays I still have 6-8 cells where nothing has come up yet, but outside there are a lot more that haven't come up. If I have the chance to get more lights, I may move the outside ones indoors as well. I read that I need to put fertilizer on the seedlings when they reach a certain size. Are the ones I have indoors about big enough yet for fertilizer? And is Miracle Grow an okay fertilizer for seedlings?
I will keep you updated on my progress and on any other things I do. I have about 100 other seeds that I think I will direct sow later this summer just to see how that works. Also, when more seeds germinate, I'm going to put them in 1 gallon pots and 4" pots just so I can see how the different sizes of pots affects root growth after a few months. Any other things I should think about trying?