If you live in the northern zones in the us this is the time to buy habiat seed. Cover seed "switch grass" can be gotten for free from you local Pheasants Forever chapter. Legumes,wild flowers adn sweet clovers. prepair the soil by either removing all grass, or cutting it as short as you can, and rake it well. Broadcast your seed blend after the first hard frost (the frezing and thawing of the goround will pull the seeds down naturally) and presto come spring the wildlife will love you...a reminder for bird watchers if you buy cattails adn tie them to stake in your yard, humming birds will seek them out for nesting material.