mine don have dwarf, confirm cause i wun like a sunflower so
small, u don't think it looks weird? usually when we think of
sunflowers, they are big!
are u intending to grow a new batch? lets grow together then share
experience and maybe see whose grown better. 
btw, did u add any fertilisers to the soil? maybe i will go down to
the those farms one of these days and ask the expert over
there.
i still got serious doubt whether sunflower can be grown in
singapore, it is native plant in USA. Tho i heard of people seeing
big stalks of them growing in singapore, i have yet to encounter
one, even in those farms. Maybe I am abit suaku or my eyes really
miss them. 
