Top: plant 艹, below: water 氵and: var. of wholly/exclusive 専 (The soil 一 is penetrated by a (sole) sprout 丨 in the rice field 田, cared for by a skillful hand 寸, which is exclusive.)
Mnemonic
(i.e. tomatoes taste often watery) Plants with water can be wholly diluted, or weak in taste.
Image of a hand 一 forearm 丨 and pulse 丶. It was originally also the distance of one inch (Length: 1 SUN = 3.03 cm) from the hand's palm to the pulse. This also stood for a small amount. In the mnemonic, it is used as "skillful hand" and partly also "to measure".
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