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Old galvanized buckets make wonderful planters for flowers, especially if you stack them for a waterfall effect.
This article explains how to prepare the buckets, what to add in addition to soil, and how to stack the buckets. Plant your favorite flowers in each bucket and you have a beautiful rustic planter. I think multi-colored petunias look perfect.
Click on the How to Make Stacked Buckets of Flowers for Your Garden link below to see the simple directions for this planter.