Rubber tree Indoor Plants

Hardiness ratings

All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets

• H1a – Under glass all year (>15C)
• H1b – Can be grown outside in the summer (10 – 15)
• H1c – Can be grown outside in the summer (5 – 10)
• H2 – Tolerant of low temperatures, but not surviving being frozen (1 to 5)
• H3 – Hardy in coastal and relatively mild parts of the UK (-5 to 1)
• H4 – Hardy through most of the UK (-10 to -5)
• H5 – Hardy in most places throughout the UK even in severe winters (-15 to -10)
• H6 – Hardy in all of UK and northern Europe (-20 to -15)
• H7 – Hardy in the severest European continental climates (< -20)

Old hardiness ratings

While we update our systems with the new hardiness ratings you may still see old hardiness ratings in your search results. These are denoted as ‘Old’.

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