I have a three foot fig tree with three figs that are almost full size.  Still quite green and haven't drooped.  I took a homemade tomato cage and put a large, clear plastic bag with a hole in top to increase the temp.  It appears that the figs plumped up a bit but it got so windy I was forced to take the bag off.

Anyone care to comment on the possible effectiveness of this approach?  Zone 4 and surely running out of time for a ripe fig.  This is not my 4 yr. old tissue culture tree but a cutting from Brooklyn I rec. last fall.

If potted take inside at night to increase temperature. Night is as important as day for ripening.

The bag will help a little but not much in my experience. As nights get longer and colder ripening seems to take forever.

Thanks! I'll start bringing it in.  If I don't get them ripe this year maybe I can rig up a homemade greenhouse on the south side to start warmer temps. earlier next year...  If the tc fig doesn't produce next year after root pruning I will use it as tree to graft onto.  I also plan to start grafting apple trees next spring.