Congradulations on 62! I know it's hard to keep up with... just never let your sim be hungry when feeding them! Don't eat the cake!!! 🤣
In my game, I can go into build mode, pick up and turn the plant around or move 1 space over and instead of having 2 snapdragon's and 1 cowberry, I have gotten up to 8 cowberries and 2 snapdragon's or some combo that equals 10. The harvestable count in my game will increase to 10 for each plant that I pick up and move (space or direction) and the spliced one's like the dragonfruit + snapdragon = cowberry. the combo's in my game always = 10 per plant when I do this.. I had 16 of those things growing.
edit: also in my game, I noticed that if we arrived on the lot where the cowplants (this should read cowberries not cowplants) where growing, that if I came home to late - like 5 am, then sometimes none of the plants would produce harvestables. If I was on the lot with the plants I want to grow, I need to be there, optimally, no later than 4 am. I think it has to do with the timers - there are so many!!!!