Question
Hi, about a week ago I planted spring onion, two different spices and some californian pepper. Last week it was quiete warm so I decided to plant them and now it is raining and its been frosty outside for 3 days. They were supposed to sprout by now and my question is will they sprout eventually? I have covered the flowerpots with things like black bin bags, cling film and recycled bags and put them in my shed so should I leave them covered or uncovered also I put them in the sun when its sunny.

Answer
I am assuming you planted them in flats rather than directly into the garden. If so, the best option is a cold frame, which is nothing more than a miniature greenhouse for seedlings. However, even when using cold frames, I only start cold hardy plants such as lettuce, spinach, onions, cabbage, peas, and cauliflower outdoors when frost is still likely. All other seedlings are started indoors and grown under gro-lights. Peppers and tomatoes are especially sensitive to frost and will normally not survive, even if protected.

In regard to germination, the colder the weather, the longer it takes. The ideal temperature for germination is between 65-70F. But even in cooler temperatures, the seeds will eventually germinate. Just double the time indicated on the seed package for every 10 degrees cooler than 65F.

Finally, unless the plants germinate in full sun, do not place seedlings directly in the sun without first hardening them off. This is a process which slowly acclimates them to outdoor conditions. Start by placing them in shade for a day or two, and then slowly exposing them to the sun a few extra hours every day. After seven days, they can be transplanted into the garden. Prematurely exposing them leaves them vulnerable to sun scald.

I hope this answered your question. Good luck, and feel free to write again if you ever need assistance.

Regards,

Mike