If you pick mandrake it’s probably best to do it when none of the neighbours are around.
περιγράφειν δὲ καὶ τὸν μανδραγόραν εἰς τρὶς ξίφει, τἑμνειν δὲ πρὸς ἑσπέραν βλέποντα. τὸν δ’ἕτερον κύκλῳ περιορχεῖσθaι καὶ λ̣έγειν ὡς πλἑιστα περὶ ἀφροδισίων.
You should scratch round the mandrake three times with a sword and cut it looking towards the west. You should dance around the rest of it in a circle and say as many things as possible about sex.
Theophrastus Enquiry into Plants 8.8