By Bonnie L. Grant You don’t need to be a collector to appreciate the many colors and forms of dahlia flowers. These Mexican natives have become garden staples across the nation, providing large easy to grow, inexpensive bushes adorned with blooms all summer. Fertilizing dahlias is key to encouraging flower laden stems and big leafy plants. The best fertilizer for dahlia plants should be high in potassium and phosphorus but low in nitrogen to prevent leafy bushes with few blooms. Start early at planting for dahlias that will make your neighbors green with envy. Dahlia Fertilizer Needs Healthy tubers are the first step to vigorous dahlia bushes. Choose tubers that are free from blemish, chubby and have plenty of growth eyes or nodes. Proper soil preparation and knowing how to fertilize dahlias will also help you achieve the massive plants with prolific blooms that are the goal of any dahlia
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