Some things I just keeping trying even though they have never worked in the past. Are you like that? One thing is grafting - I tried both a lime and a lemon tree grafted onto a citrus that grew up from the rootstock of a lime mandarin. I cut a pointed edge on the scion and then inserted it into a slit. I rested a moist bit of coconut husk into the branch above the graft to allow some moisture and then placed a plastic bag over the entire thing. Tied up nice and tight with grafting tape. The other thing I have not always had success with is pollinating pumpkins. I see lots of bees and flying insects, but supposedly pumpkins have to be hand pollinated. I have let a volunteer pumpkin have its way in the back veggie patch because at least it shades the ground. I have heard young pumpkin leaves are very tasty, but I have never tried them. This little thing was right beside the path so I got a female flower and broke away the petals then sort of dabbed it all over the stamen.