May one spill water over grass or over a plant on Chol Hamoed, such as when washing hands or emptying his cup?

It is permitted for one to spill water over grass or over plants on Chol Hamoed if he is no intent to water the plant by doing so, such as while washing hands.[1] Nevertheless, some Poskim[2] are stringent not to spill water over plants during Chol Hamoed, even in the process of washing hands.

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[1] Michaber 537:8 regarding making a water pond in order to catch fish; Shemiras Hamoed Kehilchaso 7:9

[2] Orchos Rabbeinu 2:121 that so was the custom of the Chazon Ish; See SSH”K 66 footnote 181