The physics of a garden hose are those of a straight tube/cylinder. The overtones do not fall in to the convenient pattern we are familiar with on a conical instrument. If you add a funnel on the end of your hose (come on Cabbage!) it will help the problem but not solve it. Several years ago there were several threads on this subject but I didn't find them quickly enough to show the links. Mon Chou could explain better if he chimes in. While your lips need to buzz the note you want, if the buzz frequency doesn't correspond with an overtone of your 'instrument' then you will be hosed.
The Jack Attack!
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