saved as the cutter 114 rotates with respect to the lower frame 106 while the thinning and weeding system 100 moves along the beds 101 of plants 103 accordingly the gaps 130 include an angle of about 90 degrees the arms 115 of the cutter 114 are generally sized such that the gaps 130 of the cutter 114 may be aligned to surround the desired plants 103 as the cutter 116 rotates in some examples the arms 115 have a width of about u00be inch to about 1 5 inches e g 1 inch a length of about 4 inches to about 6 inches e g 5 inches and a thickness of about u215b inch to about u215c inch e g u00bc inch in some examples the cutter 114 may be rotated at a speed of about 150 rpm to about 250 rpm e g 200 rpm the knives 132 are configured to sever leaves and stems from roots of undesired plants 103 as the cutter 114 rotates with respect to the lower frame 106 while the thinning and weeding system 100 moves along the beds 101 of plants 103 the knives 132 extend substantially perpendicularly from respective ends of the arms 115 towards the direction of travel of the thinning and weeding system 100 the knives 132 have a generally triangular shape in some examples the knives 132 have a width of about u00be inches to about 1 5 inches e g 1 inch a length of about 1 5 inches to about 3 inches e g 2 inches and a thickness of about 1 16 inch to about 3 16 inch e g u215b inch.