also for the weight heavy top plants i suggest getting a large drinking straw like the ones from say Mc Donald's cut it down so that its just smaller than the plant. then cut down the middle all the way up so that it opens up and you can wrap it round the plant gently then push in to the soil slightly that should support them untill stems get bigger and fatter then you can just simply take them off
i have never tried this just somthink i thought of sitting hear i can only hope this works and no reason why it shouldn't let us no what happens Gooood luck