How do daffodils know when to start blooming spring?

are these usually the first flowers you see?





how do they determine the week for warm weather before it arrives?





it seems like they just bloom exactly before the days start to warm up.





how do they know?





please explain.How do daffodils know when to start blooming spring?
Oh man, I'm trying to think back to 8th grade science... : )





You're right, the daffodils are always the very first signs of life in my yard, and are always a pleasant and welcomed sight. They require full-part sun, and with the sun warming up the soil, they begin sprouting up. They sprout when the soil gets to be about 55 degrees Fahrenheit, which is usually reached at the very beginning of spring.


You're right, it does seem like they sprout just before the weather starts to warm up for good, but it's just because they are more frost resistant than other flowers like tulips.


I hope I explained this well enough.How do daffodils know when to start blooming spring?
they have to be cold a certain length of time before they start to warm up. The change in temprature triggers them to grow. If they don't get cold enough for the period of time that they need then when the warm weather triggers them to grow they will grow but they won't put out blooms. So you'll just have a bunch of green leaves.
amount of daylight and temp of soil
They do not know its spring they are triggered into life by a cold spell,many plants can be fooled into growing out of season ,a spell in the fridge works wonders,but once they start to grow they need the type of weather that would be normal ie temperature and length of day light hours,I grow new potatoes for Christmas its a matter of keeping them cold enough to prevent sprouting ,but above freezing.Planted in september the UK temperature and day light hours are very close to April when potatoes are normally planted.Hope this is helpful I do on a bit when I get started.
Isn't Nature a wonderful thing? The soil starts to warm up, the days get longer and this sends signals to the plants to get started on their yearly display.





One of the many really neat/cool/awesome things that Nature does all by herself!
I agree with some of the other posters temperature and sunlight. I have so many tulips, daffodils and crocus coming up right now! its gonna be so pretty!
I think crocuses normally beat them to it.





It appears to be a mixture of the amount of daylight and the temperature. We don't notice the subtle differences but plants do.
You need to ask them kindly to come out.
First of all they ask the Snowdrops!

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