Similar to Kumquats, I was wondering if "cold hardy citrus" ( tommasville, 10 degree tangerine ect) take long to grow in the spring? My Satsuma has a lot of growth while the cold hardy varieties havent done much...Do suppose it is still early in the season

One of the ecological strategies of cold hardy and drought tolerant plants for that matter is slower growth. So be patient.

Frank the amount/depth of a varieties hardness plays a double roll, both of resistance to cold and resistance to heat. Of all the stocks for citrus trees, trifoliate is the hardiest, and it imparts to itself and to varieties worked upon it some of its cold hardiness AND its resistance to heat. The resistance to heat is quite as important as its resistance to cold, for if the tree responds to heat by starting to grow, it becomes very tender. A measure of what a variety's hardiness is, is frequently its resistance to high temperatures by remaining dormant. Cold hardy varieties like trifoliate is distinctly periodic in its growth, and it is not responsive to sudden changes of temperature during its dormant period. Most every kumquat sold is grafted onto a trifoliate rootstock, and the trifoliate rootstock imparts to the kumquat (or any cion) some of its ability to withstand cold, and also it has a tendency to retard growth in the spring. This dormancy to heat is directly proportional to a varieties depth of hardiness. Millet (1,366-)

Today is: Casualty Friday in the USA

Thanks!

Having said that, I have trifoliate and other "cold hardy" citrus that broke dormancy about 2 weeks ago in my coldframe.
Daytime temps are in the mid 80's to mid 90's but night temps are about 40°F on clear nights (which seems to have been the case for most of the past 10 days). Sudachi seems the most reluctant to begin growth but all the others have been very active. So the wide swing between daytime and night temps doesn't seem to be a huge factor in breaking dormancy. Daylight hours have also been noticeable here at 49°N latitude.

Cheers, Barrie.

One observation from 45 N:
Inground Poncirus T. finished it's flowering a week ago.
Poted kumquat (one grafted on Poncirus and one roted cuting from last year) goes out of dormancy these days.
Poncirus here seems to be a month "earlier" than Kumquat.
--ivica

4 warm days in a row, along with heated roots and my cold hardy trees have broken dormacy and are starting to leaf out

Frank

starting to get flower buds on the tomasville and the taichang lemon

has anyone tasted the taichang?

Interesting, my Thomasville is just now also showing flower buds, and Gainesville Florida is a bit south of you.

I'm surprised that you're just now getting flower buds on your Thomasville. My Thomasvilles and Tiachang have bloomed already and have set fruit. First blooms were probably about 3-4 weeks ago. To me Tiachang tastes like an inferior Keraji -meaning a slightly sweet lemon with off flavors. Keraji is way better. I have been a little disappointed in Tiachang as mine seems to defoliate easily and hasn't been a good performer. I do like its weeping leaves and form but it sure is thorny.

My Kumquat is just now starting to bloom on a few limbs, it had the first flush a few weeks ago. some of my other citrus are starting the second flush--including a satsuma.

well the Tiachang is a very very slow grower, the thomasville grows like a week.............I had a left over fruit in the spring (got tree from Stan) and it was very juicy, like a like as they say

btw neither flower has opened

The flowers on my satsuma havent opened either....................
Last fall I got about 25 fruit, I am hoping it doesnt take a year off