In article .com.au,
Daniel Hanna wrote:

One last thing. I hear that American milk is 'half-half' (half water?)

Half and half is cream for use in coffee and some cooking, less butter
fat than whipping cream.

Heavy cream,
Contains not less than 36 percent milkfat. *

Half-and-half
Contains not less than 10.5 percent but less than 18 percent milkfat.

in some places, but it's hard to believe. If that happens to be true at
all, bear in mind my 1:5 mix is with real milk.

I used 1:10 dilution for powdery mildew. Didn't harm the rose.

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Cass
Zone 9 San Francisco Bay Area
http://home.attbi.com/~cassbernstein/index.html