I'm usually at f11 or even f16. The lens I'm using has a min of f16 and f11 is a fair compromise. The DoF is still really tiny!
Quick look at your exif for the daisy, you'd have had plenty of light to knock a couple of stops off the shutter speed and close the lens down more, adding another few millimetres (!) to the DoF
Really nice the way you've hit the focus spot-on in the centre
I know there are some nature purists who will object (each to their own) but I usually carry a sable artists brush for outdoor flowers. To 'encourage' little critters to find lunch elsewhere