Nectar Sources vs Temperatures

[Haughton Honey]

Does anyone know either an on-line or literary source that outlines the various flora nectar sources available within the UK, but most importantly along with the necessary temperatures required to enable the flowers to secrete it?

Many thanks in advance.

 

[Finman]

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I have not seen figures even if have been interested on that thing 40 years.

Some experience I have:

- After rainy weathers plants need several days before they secrete strong nectar. Perhaps their sugar content rises.

- In dry soil plants start to suffer on water loss when good weathers continue

- Spring rape likes moist soil and about 20C temp. When temp rises to 25C and it is wind, rape stops nectar prpducing. Its leaves are hanging and it is thirsty.

- Clovers and Viccia needs 24C and moist soil that they give nectar.

Over all in Finland, if day temp is under 20C, nectar production is very weak.

Under 17C bees have difficulties to forage and fly.

- Rainwater plays important role in nectar production.

- Nutrition of plants role in nectar yield is important too