No more than seven plants..?

Hi All,
Im a big fan of simplifying things, and simplicity. In episode 4 of ‘Big Dreams, Small Spaces’ Monty Don relays a principle, that “No garden needs more than seven plants”, qualifying that it doesn’t need to be taken literally.
Does anyone know where that quote or principle comes from?
Has anyone tried a such a simple approach?
Cheers,
TP
Im a big fan of simplifying things, and simplicity. In episode 4 of ‘Big Dreams, Small Spaces’ Monty Don relays a principle, that “No garden needs more than seven plants”, qualifying that it doesn’t need to be taken literally.
Does anyone know where that quote or principle comes from?
Has anyone tried a such a simple approach?
Cheers,
TP
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Posts
I've a good 30 plants in my 'lawn'
A design is anathema to me but I respect the fact that other gardeners have a different view.
I think I probably could reduce the front garden to seven if you don’t count the trees.
Do bulbs count as one type, if they flower at different times of the year?
Philip