A nearby gardener will watch over your growing watermelons (excluding Harmony Island) at the cost of 10 curry leaves - either noted or unnoted. Having fully grown nasturtiums in a nearby flower patch protects watermelons from disease and thus allow players to avoid having to pay the gardener. Watermelons are necessary to grow on Harmony Island for the Morytania Diary. There are no gardeners on the island to watch over your crops.