For a deeper look at garden value, lets take an example. Say that you start a new garden. After plating a little grass you get a couple of Whirlms. Their base value is 100 so right now your garden is at 200. Next a Sparrowmint flies in with a base value of 300 bringing garden value to 500. After you plant an Apple Tree with a base value of 100. Brings garden value to 600. Break open a Whirlm and get rid of the candy. Back to a garden value of 500. It can get more complex than this in a real garden, but you get the idea.