Jeff,
You don't have anything to worry about. Flowers don't last long and some potatoes don't have any. As for harvesting you can start anytime, but you will get a lot of small nuggets rather than larger ones. The longer they are in the ground the longer they will keep. I usually, don't harvest all of my crop until mid-September. Enjoy.
Alex
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I'll plant and I'll harvest what the earth brings forth
The hammer's on the table, the pitchfork's on the shelf
Bob Dylan
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