Carrots in pots
Hi,
Ive decided this year to have a go at growing my own veg and want to start off with something easy so I've chosen Carrots. Due to limited space im growing them in pots. I've ordered some Chantenay Red Cored 2 main crop seeds But I'm unsure on a few things and can't seem to finds the answers on google. I'm hoping you guys can help me 
Will just an ordinary multipurpose compost be sufficient As a growing medium?
Will they need fertilizer? If so what type and how often should I feed?
Also how will I know when they are at the right stage to harvest them?
Thanks
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MPC will probably be too rich - mix it with some sand to lighten it up. I think someone on here recently said they use 50/50 sand to compost.
No, don't use fertiliser or you'll get forked carrots.
The shoulders of carrots are usually close to the soil surface so a gentle rootle will show you if there's a fat carrot under the leaves. If not, push the soil back, and have a look at the next one. They quite often don't all mature at once, in my experience. This may be because I'm not very diligent about thinning them out. This is part laziness but part because thinning carrots attracts carrot fly. You need to have a strategy for carrot fly deterrent. A very fine net, basically
Well the pots will be around 3 meters in the air on a shed roof so can the carrot fly still get to them?
Ha ha Well at least the carrot fly is one less problem I'm going to have then!
We have an outside toilet and the roof is flat and is a suntrap so it would be a shame not to utilise the space.
When you say a liquid seaweed fertiliser Verdun, Maxicrop do a few versions. One is a high potash tomato feed and one is a general purpose. Which one would be best?
Should I only spray the leaves or should I use it diluted in water and then poured onto the compost?