PROBLEM TO BE SOLVED: To provide a greening work for a roof part capable of reducing its maintenance. SOLUTION: This method comprises laying a water interception sheet 2 on a roof part A, setting a seed-holding material 34 holding seeds 6 on the water interception sheet 2 and arranging in a striated manner plural raising bases 8 planted with liane plant seedlings 9 on the seed-holding material 34.
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