Mid-March is the start of the spring “planting season” for those who like to propagate garden plants indoors.
Containers
Plastic trays with small pots that fit inside are a common choice for seed starting. Most trays come with clear plastic lids to conserve moisture. I thought these small paper pots were an interesting alternative to the plastic pots. They are no longer available through Gardener’s Supply Co., but if you’d like to make your own paper pots, watch this instructional video at Dave’s Garden. Another option would be to use a collection of plastic yogurt cups or margerine tubs that can be recycled after your seedlings have been transplanted outdoors. Punch holes in the bottoms to allow excess water to drain, cover the drainage holes with a bit of newspaper or a coffee filter so you don’t lose your soil, and set them on a plastic tray. Covering with a plastic bag will create a greenhouse effect. Whichever pots you use, make sure they are very clean. Scrub thoroughly with a solution of 1 part liquid household bleach to 9 parts water.
How to Make Soil Mixes
Soil mixes may be soil-based or soil-less. Here are recipes for making both:
Soil-Based Mix
- 2 parts regular potting soil
- 1 part peat moss
- 1 part perlite or vermiculite
Soil-Less Mix
- 4 1/2 cups fine peat moss
- 4 1/2 cups perlite
- 2 tbsp lime
- 4 tbsp bonemeal
A good soil or germinating mix can be purchased as well.
Before Planting Seeds
Check for specific details about the seeds you are starting. Some need darkness to germinate, some need to be pre-soaked or frozen, others do not like to be covered with soil at all.
Be sure to dampen the soil prior to planting.
Atmosphere
To promote seed germination, you will require warmth and a light source. In a perfect world we would all have a greenhouse in which to start our seeds. Failing that, the next best thing is a warm, sunny window. Again, don’t forget to check the back of your seed packets in case you’ve planted seeds that require darkness to germinate. Once germinated, they can be moved to a spot with bright light. No bright, warm places? You can always resort to a grow light.
Moisture
Moisture is another key factor in germinating seeds. It’s very important to not let the soil dry out. Water should be at room temperature. Constant bottom watering works well for flats or you can use a pump sprayer with a nozzle that can be adjusted to a fine mist for gentle watering from above.
As the seedlings grow larger you may need to water with a diluted fertilizer (5-10-15).
As soon as those first tiny sprouts pop up, you will feel like “spring has sprung”.
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