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Hydrangea macrophylla ‘Kardinal’ (Teller Red)
Hydrangea are generally one of the easiest shrubs to grow, but unlike most, this particular variety is very pH sensitive, meaning that it will thrive in any soil you provide, but the colour of the flowers will vary. On alkaline, a compact lacecap with deep red flowers will emerge, whereas given an acidic soil, deep reddish-mauve flowers will take the stage.