I think i have managed to found a way to cope with these farming patch bugs.
When i planted seeds in any patch and waiting for them to grow, they have a chance of failing by getting disseased and ending up dying. While i grew in Falador, Catherby and Ardougne various things like watermellons, or strawberrys etc i found out that; when clearing de 1st dead patch, all other bugged patches with weed will turn in either a fully grown crops or dead crops.
So instead of clearing crops because of their bugged weed, try to find the first patch with dead crops, clear them and you will see that all other bugged patch will be normal as they should be