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New RHS hardiness ratings

Following the last two cold Winters and extensive discussion by a committee combining the RHS and the horticultural industry, an extended form of the RHS hardiness rating has been agreed: Rating Min temp Geography H1a 15ºC+ Indoors H1b 10ºC Greenhouse, … Continue reading

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Plantify includes references to three hardiness zones RHS (UK) Typically these are H1 (requires glass) through to H4 (fully hardy). Intermediate zones are indicated as H1-2, H2-3 and so on. The H1 zone is further subdivided by the minimum temperature … Continue reading

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