The cost of giving a gardener a Christmas present depends on many factors, such as the type of present you want to give and the gardener's preferences. You could spend as little as a few dollars on a small gift, like a packet of seeds or a pair of gardening gloves, or you could spend more on a larger present, such as a power tool or a gardening book. It's also important to consider the gardener's individual needs and interests when selecting a present.