http://mygarden.rhs.org.uk/forums/225.aspxAn area for questions, queries and conversation on general gardening topicsCommunityServer 2007.1 SP1 (Debug Build: 30415.43)http://mygarden.rhs.org.uk/forums/thread/28908.aspxThu, 20 Nov 2008 18:39:48 GMT067b4958-8d6e-4ae0-88b5-4af491fdf8f2:28908bogweevil0http://mygarden.rhs.org.uk/forums/thread/28908.aspxhttp://mygarden.rhs.org.uk/forums/commentrss.aspx?SectionID=225&PostID=28908This is nothing to worry about. Trees have years of dearth and years of plenty - why? Well perhaps due to frost at flowering time, drought when forming flower buds in autumn or because exhausted after a preceding year of heavy seed crop. Also it is very likely that trees have evolved to have &quot;on years&quot; and &quot;off years&quot; so that seed eaters, birds, squirrels, etc, can be starved out in lean times so they can only take a small percentage in years of heavy seed production leaving the rest to grow. Boggyhttp://mygarden.rhs.org.uk/forums/thread/28902.aspxWed, 19 Nov 2008 22:17:15 GMT067b4958-8d6e-4ae0-88b5-4af491fdf8f2:28902kgibb0http://mygarden.rhs.org.uk/forums/thread/28902.aspxhttp://mygarden.rhs.org.uk/forums/commentrss.aspx?SectionID=225&PostID=28902<p>my oak tree has not produced a single acorn this year and neither has my sister&#39;s - she lives about 15 miles away</p> <p>Any ideas why?</p> <p>How will it affect the local wildlife - although I live in an urban area we normally have lots of jays.</p>