Spacing Dahlia tubers 18" apart and planting them carefully. These tubers came in fairly large clumps and we mixed the compost in with the soil as we tucked them into 100' rows. We laid out irrigation line but it is not recommended that you water dahlia tubers until they start poking up through the soil. Then water them well a few times a week. The tubers can rot if they are kept consistently moist.
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