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Depending on the lawn treatments, the best times of the year to redo your lawn are between mid-August and mid-September for overseeding and renovation treatments. For areas such as the southern United States, lawn aeration works best during the fall, when the temperatures begin to drop. Otherwise, early spring is your next best bet because the grass is fresh and ready to absorb nutrients, and the temperature isn’t hot enough to fry the grass and the renovation materials.

When stored under ideal conditions, grass seed lasts anywhere from 10 to 18 months from the testing date without any real decrease in the germination rate. You can still use the seeds after this timeframe, but the germination rates drop 10% to 20% each year. 

If you’re just embarking on an overseeding project, using seeds that have been in storage for a few years isn’t too big of a deal. However, if you’re planning on redoing your entire landscape, your best bet for a healthy, luscious lawn is to use new seeds.

Orchard grass seeds can spread quite easily, traveling with the wind as well as birds and animals. Common grass seed packets, especially in the popular tall fescue variety, may contain the occasional orchard grass seed by accident. Always purchase high-quality turf grass seed without "other crop seeds" mixed in.

Even the most shade-tolerant turf grass needs at least three or four hours of full sunlight or a good amount of partial sunlight throughout the day. You might want to look at other gardening options for full shade, like plants that can survive in full shade, hardscaping, or structural architecture, to still get that yard of your dreams without compromising on your landscaping design.