Ms Powell changed her design after the frost-free spring led to some plants flowering earlier in the year than usual.
“This spring may have felt very cold to people, but it has been unseasonably warm from a horticultural point of view, because we haven’t had the frosts,” she added.
“The plants haven’t had that pause during freezing weather, so they’ve kept going and flowered earlier than in a ‘typical’ year.”
She said she was “really excited” to get the chance to work with beautiful plants not normally seen at Chelsea.
“I’m all about experimenting and having even more plants to choose from,” she added.
“But this isn’t just about nature throwing us a quirky spring… there’s a pattern and we all need to adapt the way we garden, with more unpredictable and extreme conditions in mind,” she said.
Coverage of the RHS Chelsea Flower Show will run across eight days of broadcasts on BBC One and BBC Two, concluding on Sunday 26 May.
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