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In our village they have a competition for kids to see who can grow the largest sunflower head (not the tallest). A few years ago our daughter planted her sunflower on top of a hole filled with the previous year's manure where I had grown courgettes.
The plant didn't grow particularly tall - about 7 feet - but the flower head was HUGE, 21 inches across excluding petals.
Slight problem - I may have planted my russian sunflowers a bit early (February) and they are all (22 of them) 30-50cm tall and growing 2-3.5 cm every day! I don't have space to keep 22 sunflowers indoors for another 2 months - I reckon they may be 2m+ by then! When is the earliest I can plant them out?
Could you start hardening them off outside for a while each day. (I know it's a pain bringing them in and out.) I'd pot them into bigger pots so that they are more sturdy and bring them back in if cold weather is forecast, and then out again when it's mild. And you could sow some more now, for insurance. Is there some way you can stack them?
Liam, start hardening them off - in last year's long cold spring we had self-sown Russian Giants peeking up through the melting snow!!!
Last week I sowed some outside directly into the bed where they are to grow.
I've been growing them for many years. They're great for pollinating insects as well as birds and squirrels.