Reading Your Seed Packet – Light and Depth Requirements By Joyce D’Agostino

Photo: Pexel

As we prepare to start a new gardening year, those of us who enjoy starting plants from seed are probably already purchasing our seeds or browsing catalogs arriving in our mailbox.

Once you have made your selections, one of the most important items to note is the important information often listed on the back of your seed packet. Part of the success of growing from seed is using that information to start the seed not only at the right time, but also other essential details such as how deep to plant the seed.

This blog will cover the light and depth requirements for planting your seeds. 


We often hear that someone purchased seeds from a reputable company, planted those seeds and said that none of them germinated or that they failed to thrive and feel that the seed was inferior. As we ask questions to learn more about their issue such as how they planted the seed, we often learn that the gardener didn’t realize that the planting information was listed on the packet. They also were unaware of how important it was to read this information in order to help in better sprouting success.

The information about planting depth and light requirements are listed right on the packet - usually on the back. As you can see with the attached examples, there is a wide variety of conditions that must be followed when planting the seed. Some seeds require light to germinate and must be lightly pressed onto the seed starting mix. Others must be planted at a certain depth or may require a period of cold and moist treatment called stratifying that helps the plant break its dormant state.

Photo: Joyce Agostino

Photo: Joyce Agostino

Following the instructions as to when to plant inside or outside or the size of pot or container to use is also helpful, such as noted in the lavender bulletin shown below. If you’ve had difficulty in growing a certain flower, vegetable or herb, it may be due to just starting too early, too late or planting too deep.

Photo: Joyce Agostino

Also note what zones the seed packet recommends for best results. You can find your zone listed here: HardinessZone.  (Click on your state for enlarged photo). Zones are important because even though you may have started your plant correctly, growing outside your zone can result in the plant not having the right temperature, light and length of growing season to reach maturity.

Take a few moments to read your seed packets and make note of any special handling or requirements so that you can get the most from your seed investment.  Refer to the bulletins listed below for more background on starting your plants from seed:  Lavender, SeedPackets, Seeds, PlantTalk