Ave high and low temp

[Unicyclemike]

I am in zone 7 trying to grow several varieties of hardy citrus outdoors.  I have the owari satsuma, swingle citrumelo, Taveres limequat and the Xie Chan.  In order to get fruit to ripen before it gets extremely cold what time in the spring do they need to start flowering and what low temp do I need to maintain in order to get them to  flower to ripen roughly on schedule in the fall?  I overwintered a ponderosa lemon outside last winter.  I understand how to get a citrus to survive 2 degrees F. last year.

[poncirsguy]

It is much easier to get an early spring start than to keep them growing in the fall.  It still may be very difficult to get the spring jump for fall ripening before frost.  Have you considered much earlier cold hardy satsuma varieties.  I am stuck with the same need for an early start for my citrus trees in Cincinnati.  I have not been successful for any of my citrus trees for early pre-frost fruiting.  My best guess would be to provide heat and extra light in mid winter to induce flowering and growth.  Even under 4 layers of glass heating would be very costly for me.  Lighting is cheep with these new LED lights.

[Unicyclemike]

Thank you for your response.  Keep us posted on how you keep your citrus alive over a cold cincinatti winter..