Good evening ,
I like to show this plant white grapefruit in the following link, this winter despite having covered with a cloth not cloth I look for a moment the citrus and I noticed that it has lost all its leaves, I state that the plant now cultivated in pots until a year ago was planted in the ground in the area of Forte dei Marmi-Tuscany-Italy (climatic zone 9B, while the mine is a 9A/B), in fact, was given to me for the sake of moving, and when it was transferred to the vessel leaves have yellowed, It mades some flowers and was about to make a fruit when then the wind did fall.

This is the link:
http://www.forumdiagraria.org/download/file.php?id=58229&mode=view

I hope can help me

thank You everybody

Leonardo grapefruit are hardy down to the high teens F. My Rudy red & Duncan grapefruit went through a bad winter with a low of 17F and had no damage at all. Is your tree still in the container or in the ground?

Also what is the fruit in your avatar?

The tree is in the conteiner, because i haven't a garden :/..

The fruit on avatar is a type of clementine said "Rubino" in english "Ruby", because this citrus is very red. It is an hybrid beetween a citrus reticulata with a citrus sinensis Blood

Interesting, I have seen them quite red but never purple.

i know
my clementine is purple because the rootstock is a poncirus trifoliata flyren dragon, this rootstock give more pigmentation at my clementine