Lee cautions that a common mistake growers make with dahlias is related to cold wet soil , warning , “ Don ’ t pot up dahlia tubers and water them — they are not growing yet , don ’ t have roots and don ’ t need water . I realize that watering new plant babies is a hard thing to resist , but go against the urge to water until there is vegetative growth . Once they are actively growing , they will tell you when they are thirsty .”
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