I gave that up.
Now I let the stems pretty much have their way. And I put in some of most everything that's blooming. This approach produces a sort of oddness, and doesn't reach levels of doing weddings or of ikebana, but it's a great pleasure to me and keeps a little something live on the table.
That big round thing on the right is a mock orange, BTW, a wonderfully eccentric plant. The fruit has the fuzz of a peach and the size of a plum, smells like an orange, and maybe I'll get emboldened and taste one.