Our lupines (also called lupin in the UK) were done flowering for the year and were harboring an aphid infestation, so I mowed them. Are the "stumps" likely to regrow next year or do the plants rely on gathering a lot of energy through the foliage to survive the winter?

(They were originally weeds scavenged from a roadside that we multiplied here over a couple of years, so it's not a major loss if they won't regrow.)

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    Update, a year later: As Jessica mentions in her answer, they regrew and a couple of them even flowered again in late summer. – bstpierre Jul 16 '12 at 18:53

It's hard to tell off-hand if they'll regrow or not, as it depends on a lot of factors such as how low did you mow it, how much damage have the aphids caused, how well developed is the root system, how bad is the winter, etc.

Usually, plants need to "prepare" for the winter by shutting down their flower/fruit production and stockpiling energy, and taking steps to reduce their energy consumption. Given that the plant has not had much chance to do any of this, I wouldn't necessarily bet my money on it. However, since there is some more time till winter, perhaps it might work out too.

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I get the same problem with my lupines every year and about this time I harvest the seeds and cut them back. They always grow back and often I get some flowers again in September. I cut mine last week. That was the end of the first week of July. Good luck.

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