When planting seeds outdoors, whether flowers, herbs, or vegetables, it is best to avoid applying fertilizer spikes at the time of sowing. Most university extension services recommend having your garden soil tested first. A soil test kit is available at most MSU Extension offices. Mix a granular fertilizer based on the soil test recommendations or use compost and mix either one into the soil before planting, rather than placing concentrated fertilizer sources directly with the seeds. This helps prevent seed or root burn and ensures nutrients are available as seedlings develop. Once sprouts appear and have a few true leaves, you can begin supplemental fertilization if needed.

For more detailed guidance, consult reputable sources such as:

• University of Minnesota Extension – Managing Soil and Nutrients in Yards and Gardens Managing soil and nutrients in yards and gardens | UMN Extension
• Penn State Extension – Vegetable Gardening Basics PA_Veg_agrs115.pdf
• Michigan State University Extension – Fertilizing Established Perennial Gardens Fertilizing established perennial gardens – feed ‘em and weep - MSU Extension

These resources provide full information on fertilizing practices for outdoor seed planting and can help make certain healthy plant growth.

Thank you for your question and have a great gardening session.