A new geranium plant named `Guilan`, characterized by single- type flowers with 5 petals per flower that are vividly carmine-pink in color; corolla diameter of 60 mm; early flowering which is luxuriant in the summer; plant habit that exhibits excellent branching with internode lengths of approximately 30 to 50 mm, plant height of approximately 120 to 150 cm, and ivy-shaped foliage lacking variegation but with distinctive green veins.
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