While the tops of container plants may be quite hardy the roots are vulnerable to frost. Here are some easy steps you can take to protect them in cold weather.
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Keukenhof
Lisse, Netherlands
Rio de Janeiro Botanical Gardens
Rio de Janeiro, Brazil
RHS Garden, Wisley
Woking, United Kingdom
Royal Botanic Gardens Victoria
Melbourne, Australia
Koishikawa Korakuen Gardens
Tokyo, Japan
Humble Administrator's Garden
Suzhou, China