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Yes you can.
Obviously there is a risk of the grass taking light and moisture.
The biggest issues you'll face imo are how you mow and what happens next year.
We re-did our patio and as a result there were a load of homeless plants. I put red robin(?), poppies and other misc flowers in a patch of the lawn. It looks a bit shit right now, but up until a month ago the long grass with seed heads interspersed with flowers looked great. Don't have any good photos from the, but this is what it looks like now. As you can see the flowers have died back with the foliage hidden and rhe grass has got too leggy.
The other photo is where I chucked the fushas and the grass and existing chives have grown up around. Again cutting the grass poses a challenge. (sometime over the early spring this will be a bed again).
Ah cool, that’s what I was hoping.
Next question: my front garden is basically a slope of grass; can I just dig holes and plant stuff amongst it, or will the grass smother it out? Would I need to plant established hardy bastards? There’s a flat patch at the bottom where I was going to put a bike shed but fuck me they’re expensive. Will probably just plant some tall pretty stuff instead and keep lugging the bike into the house.