How do you feed your syrup when you're just feeding it in the morning?
I rob all honey away from hives and then I am in a hurry to get them ready for winter.
If it is cold weather 0C - 10C I give warm syrup in the morning. I mean,
during night syrup becomes too cold and bees take it too slow. Bees take warm syrup during one day. Feeding box is 8 liter and I hive 2 boxes to one-box hive and 3 boxes to 2-box hive. On avverage I give 20 kg dry sugar per hive. It is for 9 months.
If they are not willing to start, put some honey into room where bees are.
What's the most practical method to feed warm syrup in cold weather?
In ultimate situation, when bees have started to hibernate, I pour syrup into combs and put frames into the hive. I may put syrup frames into another box and that box under the wintering box. It is quite a hum in the hiver and they need some days to get things into order.
If weather is good, temp about 15 C by day and night warm, it is same what you do.
I use commercial plastic boxes as feeder. I am very satisfied on them. I have had them same boxes about 20 years. I have tried many home made systems.
Normally it takes 1 week, and all winter food is inside hives.
2 box hive 16 + 16 liter syrup during 2 days and then wait one week and hive the last 16 liter. Then feeding box away and warm inner cover on.
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In spring I even capped frames between hives ....... or pour 5 kg sugar as syrup direct into combs.