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m5eaygeoff wrote:

Nowhere in Britain could you keep Serissa outside all year, I go by the weather we get not so called zones which can be confusing and inaccurate at times.

Is this something you have first experience off? Can it be other reasons than the temperatures?

This species is readily awailable in UK garden centers classified as H3 in UK way of measuring hardiness.

From RHS site:

"H3 – Plants are half-hardy. They can typically cope with a very mild winter, or in an unheated undercover growing area (greenhouse or polytunnel) in most parts of the UK."

Maybe going OT here. TS proboably not have any frost at all. The issue is likelly heat and sun, not temperature and moist.

m5eaygeoff wrote:

Nowhere in Britain could you keep Serissa outside all year, I go by the weather we get not so called zones which can be confusing and inaccurate at times.

Maybe the best thing said on this thread so far. Agree completely.

What we say in the US is climate is what you expect; weather is what you get. Climate zones tell you what to expect and are useful for deciding what trees probably won't grow.

But they don't tell you what you will get this year. My elms and some other trees started popping out a couple of weeks ago. I have some azaleas that started flowering in May and are still flowering. You get what you get, not what the calendar says.

I feel the topic is drifting a bit

50 years of data combined with experience can obviously not tell you something about the weather tomorow. But it is an usable guidline for deciding what may work. In this forum we have had people asking what is wrong with their maples growing in arabic desert. If they checked before what is the combined experience from growing maples they would not get the tree in the first place. USDA zone classification is just a way to turn tremendeos amount of experiences into easily understandable data. Its a guideline, not a climate forecast tool.

But yes, when you brought it up, it may make sense to add one zone to your area in most locations. 50 years ago it was advanced to grow species out of their hardiness zone. Now many people do it and I am sure the it is not because of increased growing skills.