The gardens are bursting into life again this November because of the mild weather.
The warm weather is prolonging the bloom of flowers and plants for months longer than usual.
Their change in behavior could affect the spring.
The month of November in the UK has been 2.2 degrees warmer than the average.
There are some unseasonable sights in the public gardens of the Royal Horticultural Society.
"Anything we'd expect to flower into October, like fuchsias and salvias, are still flowering now and show no signs of slowing down," she said.
The flowering season is extended because roses are putting on new buds.
Coriander is still growing in my pot.
The way our greenery is responding to the mild weather is crazy and mixed.
"If you look out of the window, you'll see a mixture of trees that are stressed from the drought and have some leaves, while others have dropped their leaves weeks ago," she said.
Some are sticking to the timetable while others are coming into bloom for the first time.
The life cycle of our gardens has been disrupted by a series of meteorological events this year that have affected the life cycle of our gardens.
"During the summer, a lot of plants became inactive, but they were doing it because it was too hot," she said.
We've had a lot of rain this month, and it's been very mild, so it's produced a lot of new growth.
The turn of events could have a negative effect on our gardens, as the horticulturalists warn.
Ms Barker said that some plants may flower later next year.
When things get out of whack, the things that feed off them like insects are thrown out. A lot of life cycles could be disrupted by it.
Extreme weather events are happening more often. We don't know the effects for a long time.
The month of November has been considerably milder than the average over the last three decades, according to the Met Office.
The UK's gardens are likely to return to normal soon after the spell of sunny weather ends.
From the middle of next week, high pressure will move in from the west, which will settle the weather down, according to a National Weather Service spokesman.
There will be less rain in the south east and temperatures will return to normal.
Extreme weather events in the UK can become more intense due to climate change.