This bush is in Tennessee, USA.:
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2$\begingroup$ @DevashishDas , red horse chestnut is a tree...the Q. refers it as a bush... $\endgroup$ – souvik bhattacharya Nov 12 '14 at 18:54
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1$\begingroup$ Maybe the tree was young so looking like bush. young trees sometimes can flower. $\endgroup$ – Always Confused Sep 10 '16 at 16:44
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$\begingroup$ Not sure about the ID, but those are definitely flowers, not fruits. You can see some of the fallen blossoms on the leaves in one of the photos. $\endgroup$ – Clem C Sep 14 '18 at 21:08
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$\begingroup$ Red flowering Japanese knotweed. $\endgroup$ – John Peterson Sep 21 '18 at 12:15
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Polygonum cuspidatum, common name Japanese knotweed. A notorious invasive species.
It's actually a herbaceous perennial (those stems grew in just one season, and will die back to the ground at the first hard freeze), not a shrub. The red things are ripening seeds, not flowers.
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$\begingroup$ Can you please add some reference to support your answer? $\endgroup$ – WYSIWYG Jan 10 '15 at 6:54
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$\begingroup$ Polygonum cuspidatum? Google shows white flower for them. $\endgroup$ – Always Confused Sep 10 '16 at 16:41
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$\begingroup$ It is quite showy as it booms in cascades of silver flowers in late August that turn an intense magenta and then to scarlet each year right at time of the solstice. --Bitter Orange and Japanese Knotweed $\endgroup$ – iayork Sep 21 '18 at 13:27
