en.wikipedia.org
en.wikipedia.org
gardeningknowhow.com
nativetreesfromseed.com
nativetreesfromseed.com
https://nativetreesfromseed.com › identify › blackthorn
rhs.org.uk
britannica.com
treesandshrubsonline.org
Trees and Shrubs Online
https://www.treesandshrubsonline.org › articles › prunus › prunus-spinosa
peiinvasives.com
peiinvasives.com
https://peiinvasives.com › blackthorn
ucc.ie
University College Cork
https://www.ucc.ie › en › tree-explorers › trees › a-z › prunusspinosa
garden.org
The National Gardening Association
https://garden.org › plants › view › 111533 › Sloe-Prunus-spinosa
practicalplants.org
Practical Plants
https://practicalplants.org › wiki › prunus_spinosa
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