Dear Maria,

have you tried the CTAB extraction method? 

https://link.springer.com/article/10.1007%2FBF02772108

kind regards, Harrie Verhoeven

Hi Maria,

as you mentioned Orchids has a high amount of polyphenols and polysaccharides. I agree with Harrie on using CTAB and also you can consider treatment with Rnase A and phenol-chloroform  suggested by Honda and Hirai

https://www.jstage.jst.go.jp/article/jsbbs1951/40/3/40_3_339/_article

in addition, a similar question with good answers is already on RG, Please see

https://www.researchgate.net/post/How_I_can_extract_DNA_from_orchid

Hope it will help

Amin

Thank you so much! I will try CTAB for strawberry leaves,

Kind regards,

Maria