I am looking for an old sci-fi series. Probably 1960s. I think there were at least 3 books.
One distinct thing i remember is they used plant leaves as swords. The plants were native to that planet
Stump the Bookseller
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Do you possibly remember Zilpha Keatley Snyder’s Green Sky trilogy? It comprised Below the Root, And All Between, and Until the Celebration. They’re juvenile books written in the 1970s and I don’t remember them well let alone whether leaves were used as swords, but your points of leaves and trilogy made me think of it.
A bit of a long shot but maybe Harry Harrison’s Deathworld series? I don’t specifically remember leaves as swords but the animal and plant life was certainly capable of warfare.
Even longer shot. Maybe something in the vein of Big Sword • (1958) • novelette by Pauline Ashwell [as by Paul Ash] ( Astounding Science Fiction (UK) – 1959) The plantlike migratory creatures grow swords in order to defent themselves.