Could watering with warm water help?

Thanks for the link

I am doing something wrong, but i do not know what. I closed the balcony with so called finnish glass, planted them in huge terakota containers, water them only with stayed or boiled water, only organic fertilizer.  last year i was happy to see them surviving winter untouched, only to see them losing all the leaves in spring and summer.

funny thing happened last week. I forgot to shut off water while watering one in ground lemon, which always had pale light green leafes. In 3 hours i realized what i have done and shut down the pipe.
Next morning the leafes turned dark green.  I war surprised to see such difference in color in just one night.   

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redblush grapefruit

last january was first true test of my trees. Temperature in nearby Split dropped to record -7,2 C, which is second coldest ever and coldest since 1963 (-9). Lemons in Split and rest of Dalmatia suffered a lot. Most have never experienced such lows.  However oranges, grepfruits and tangerines mostly survived. I grow citrus on the island, which is warmer than the coast, so all of my trees survived including star ruby grafted on volkamer lemon, persian lime, feminelo lunario....

I planted tarocco grafted on citrange troyer few years ago. It proved to be good combination. Last year had 50 fruits. This winter survived -4 C with only small leaf loss. Also survived hot dry summer with minor damages, and i was not there to water it regularly. On the other side moro grafted on citrus aurantium did not do so well.   

here is one in local bar loaded with fruits.

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One of my oranges is grafted on citrange troyer. That one grows much faster than ones growing on poncirus and citrus aurantium.  Second fastest is star ruby, which is grafted on volkamer lemon.

Just ate tarocco from my tree this morning. Only a bit red colour, but it tastes better than moro and navel.

Good idea. Many of them do not know about this forum.

photos 16 and 17 in the album

Thank you Millet for this text. I was just wandering what could happen to my balcony trees, after i forgot to close balcony enclosure last saturday. When I came back home at 6 in the morning the temperature on the balcony was -1,9. Probably nothing serious happened, because that temperature lasted couple of hours. So far i see no damage, but it is still to early to say.