How can I protect my bulbs from the frost?

Garden Experts
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Hello Mr. Kötter, in the 1st half of the month of November, I received 50 different bulbs from acquaintances; tulips, crocuses and hyacinths. I had already planted all my bulbs and wanted to plant these bulbs into three large plant containers for my patio. I planted these in three stages in the following sequence: tulips, daffodils, crocuses and hyacinths, and then placed the containers in the garden. I didn't protect the containers for winter as the temperatures were not extreme; but I did cover them lightly. Yesterday I checked the containers and noticed that the bulbs have already produced shoots which have risen approximately 3-5 cm out of the earth. I have spoken about this with my neighbours, and everyone has a different idea on the subject. There were a number of different suggestions made, yet everyone was of the opinion that the bulbs require frost in order to develop properly: I now turn to you. My question is, what do I have to do to protect the flowers without damaging them should the frost return? Should I wrap them up and protect them against the frost, or should I take them into the house where they can be protected against frost? – I would be very grateful for an answer.

The GARDENA gardening expert

Dear Mr. K., you have done everything correctly, and your method of planting different types of bulb in layers over each other in the so-called “lasagne” method is a good one, through which you will experience a sequential firework of colours in spring. As far as the frost is concerned, a brief cold shock is required to prepare the plants for the coming of spring in the so-called vernalisation for budding and for blossoming. 

However, the cold weather we have now is quite sufficient to provide this effect. Simply leave the containers with the bulbs outside. It is too hot for them inside. Ensure that the earth remains damp enough, but not too moist. Only if the weather were to get very cold again should you place the plants in a protected area, for example in an unheated shed, or cover them with fleece. 

This doesn't protect them against low temperatures, but palpably insulates them against severe temperature fluctuations. Apart from this, a temperature range of minus five or six degrees does not affect the bulbs.