Pennington Lawn Booster Sun & Shade Grass Seed Mix contains Smart Seed, fertilizer and soil enhancers that boost thinning lawns and enrich soil to promote healthy grass. Use Lawn Booster to overseed existing lawns receiving 4-6 hours of daily sun. Plant in the spring or fall when average temperatures are between 60 - 75 degrees, and expect a greener, thicker, and healthier lawn in 8 - 21 days. In 1945, we planted our roots to help you create the lawns and gardens of your dreams. You see, we don't see yards as curb appeal, but rather as a little slice of earth to call your own. A living, breathing ecosystem where you can plant your roots and nurture them from the soil up. A space for creativity and celebration with those we love most. Whether it's seed, soil, fertilizer, flowers or bird feed, we believe our products should work with nature, not against it. The way Mother Nature intended.