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Pardon me sir, is that the Chattanooga choo-choo? No, it's just the railroad ties you're using for garden landscape edging. If you're gardening without a lot of green, you can do your garden planning on a budget with inexpensive materials such as railroad ties for garden edging.
Railroad ties work best as landscape edging on straight and level ground, and can be placed horizontally or verticially. They make s strong, decisive statement--you don't even need the singal lights or a train whistle. You can use railroad ties to enclose any raised bed garden design, although it's best to stick to square or rectangular sections--just make sure to dig a trough in hard soil and hammer the ties firmly.
Don't worry about damaging older railroad ties--they actually last longer and look better than newer ones, which can leak creosote and other toxins into your soil. Now if you could just keep your kids and hubby from building a train set around your garden, you'd be fine.