Red Maple
(Acer rubrum)
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Red Maples are 
easily recognisable deciduous trees which grow to 18-27m in height. 
 They are often found in swampy areas as well as near houses where they are used as decorative trees. They 
differ from Sugar Maples in that the Red Maple’s leaves grow after they blossom.
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Their leaves are 
red tinged in spring, green in the summer, then turn bright red in the fall | 
    
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They have smooth, grey bark which becomes scaly on older trees. | 
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Female maple 
flowers are bright red and have long stems. 
 The twigs are 
red, hairless with white specks. 
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Male maple 
flowers are greenish yellow with shorter stems. 
 Notice the 
leaf bud at the tip.  | 
    
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This shows a 
group of male flowers still in bud. 
 Notice how 
they appear red before blooming. This can cause confusion with the female 
flowers. 
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Trees may bear 
all male flowers, all female flowers or a mixture of both, but on any individual 
branch all of the flowers are generally of the same sex. 
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New leaves 
emerging from leaf buds 
 
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By June the male 
flowers have fallen and the female flowers have developed into seeds or 
‘samaras’. | 
    
Choosing your tree
- •Choose a tree with male flowers in an area that you visit regularly
 
- •Avoid trees which are within 10 metres of any buildings.
 
- •Tag your chosen tree using a ribbon or other marker
 What to record
- •Record when the first male (yellow/green) flowers open (in three different places on the tree)
 
- •Make a note of when 50% of the male flowers are open.
 
- •Finally, record when the first leaves push out of their buds and unfold completely (in three places on the tree)