Fox, I grow container citrus, including grapefruit in zone5. Keep outside as long as possible, (not under 40-45) then place in a not too hot room. Do you have a south or west window you can place your trees?
How tall are your trees now? When you do prune, be sure it's not before citrus will bloom/fruit..Toni

Toni,The trees are about 4' tall, the satsuma was shipped with 16 satsumas on it. All but three fell off, those three are growing and the trees are putting on new leaves by the bunch. I do have a sunroom that faces south maybe I can clear out a place for it there.

Hello foxslipper,

Have no fear. I live in a 7a zone with 6b right down the street almost literally. I grow 3 Duncan Grapefruit trees and are 7' tall (almost). I find you can keep them outside usually until November, although with the exception of 1 night last year when I pulled them in, they stayed out until; December 11th due to the warm winter we had and were out at the begining of April. My grapefruit are fairly hardy and can most likely survive about 20 degrees at night, however since there is no need for that I usually pull them in around 35 degree overnight temps as usually some sort of frost is forming outside even though it's above freezing. Over the winter I keep mine in an Easterly facing window off to the side so they get medium light for the mostpart over the winter and slow down. The only thing I do suggest is give them some sort of bug spraying, like horticultural oil a week or so before you think you will pull them in. Otherwise you may get struck with unforseen bugs that will come in with it during the winter. Mine took scale with them and had a hell of a time during this past winter fighting it. Hope this info helps.

VTY
-Mark

Thanks for the info Mark, it's always nice to hear about other people's successes. Do you prune to keep them? What other kinds of citrus are you growning?
Sherry

Sherry, I agree with the bug repellent. I use Fish Emulsion (foliar) to keep bugs at bay..It works fantastic..I learned this trick from a woman I buy my citrus from..She and her family been using FE since the 60's and have been successful. I tried it for the first time last autumn before bringing them indoors for winter. Every so often I'll see mites, but last year not a one. It also works as a preventative for scale, mealy, etc..Toni