I'd move them outside during frost free days but bring them back in on a night. when you say lobelia which one? are they the trailing ones? the geraniums Id pinch out the tip of the plant. this will encourage the plant to sprout side shoots.

Yes Seaburngirl it is trailing waterfall white.
Thanks for your tips :-)

Also make sure they are getting enough light and not getting drawn and spindly.

I would still nip the tops out,Willinilli,even though it is a trailing one..it needs to bush out as well as trail..and when it looks as though it is getting straggly throughout the season..and it will..give it a haircut..it will go on well into Autumn...:o)

They are on a windowsill so light is not a problem Steragram.
I will try nipping the tips out Bloomer, I think your right they need to bush out abit.
I dont know its like having babies to look after! Lol.

Lol,Willinilli..just as time consuming,I agree..but at least they don't scream and cry ,and get you up in the night ! :o)

Well if you read the link that severnside & Fran were talking about "Do plants have feelings" I might be getting a baby monitor!
I have just been up to nip the tips out & I was going "La La La" so I could'nt hear them screaming! Lol

You have a sadistic streak ,I think.! Lol...I haven't seen that link,Willinilli..oh dear,do you think I should ? I might never prune again ! ..:o(

No don't do it Bloomer, I think with the way we all love our plants now, if we all read this plants would take over the world.
Day of the Triffids!!! Lol

I am going to look..later..and I'm sure it was on TV..I think it's recorded somewhere,among all the stuff I have yet to watch,and never get round to..:o)..I will have my cushion ready,to hide behind..like I do with really scary films ! Lol..

Thanks for posting this because it saves me asking the same question. My lobelias and geraniums will be getting nipped tomorrow and then planting my sweet peas :-)