Greenhouse beginner
kjdintown
Posts: 42
Hello All, I'm in my first season of using a greenhouse and to get me started I ordered a lot of bulbs which I happily potted up in B&Q multipurpose compost. I had long black trays with matting in them and put some grit on top then stood my pots on the grit. I thought the idea was that the plant roots would reach down to get the moisture therefore, grow good strong roots. I can only get to garden at the weekends so I thought this would be a good idea to ensure there is water through the week, that said, I don't drench them at the weekend, they only looked like they needed one water over the weekend but I did put 'a little' water in the tray - just enough to reach all pots but not that you would see it under the grit. Problem is - on checking the soil lately (things should be growing by now), a lot of the pots are surprisingly wet to the touch. I tipped one out today to find a rotten dahlia bulb and am worried about the rest but don't want to tip them out unless I have to. What have I done wrong? Do I tip the rest 
or see what happens?
Posts
Your problem is ;-
You've choosen the wrong method of watering. This method works best for potted plants. Tip them all out and see if any have survived.
Bulbs only need moist compost/soil. They probably only needed a drink once a week/fortnight in cool weather.
We live and learn.
kjdintown
Simply too wet, too cold-there has not been enough sunshine to warm the greenhouse naturally.
I too would tip them out to see if there is anything growing.-sorry.
oooowwwwww - I thought you were going to say that.
Thank you for replying. So if I'm planting bulbs I don't have to sit them in anything, the pot can just sit on the shelf. Well that's a good GH lesson learnt. Am I doing the right thing with the matting and the grit - watering the grit rather than the plant, or a bit of both? 
What you want to achieve is a system where the roots can breathe -having the pots sitting in water for any length of time will just cause them to rot-I don't think the matting/grit thing is ideal
Visiting the greenhouse once a week in Summer is going to cause you a lot of disappointment I feel -you are going to have to employ a recruit to look after things if you can't yourself-of course I don't know your circumstances
Ideally you will need to visit your greenhouse for a few minutes each day in Summer - to open the door and windows for good air circulation and to bring the temperature down as a greenhouse can get VERY hot ! I wet the path down with water in the mornings on very warm days as this also helps keep the temperature down and deters red spider mite which can be a problem in hot dry conditions.I have invested in a Max/Min thermometer which tells me the lowest and highest temperature in the greenhouse. As Geoff says the trays with matting would be good for potted plants with a good root system and will also help with the humidity. I feel like I have given you a lecture - sorry- It is just that I am a very keen greenhouse gardener
Pam x
My pot plant greenhouse last Summer
Thank you both very much, I work away in the week which is a pain and Pam it didn't sound like a lecture but I'm up for it every time - not gonna learn otherwise
.
I have an auto window opener but I expect that's good but not good enough. I have bubble wrap still on the back and side of the GH which are both up against fencing and I've been looking at green GH shading (it's quite thick) and to me I can't see the point of shutting the sun out but probably by next year I'll have changed my mind?? Should I get the shading and does it go everywhere? It's only a 6x4 GH and I quite like the idea of being able to see in it at the mo, my garden is only about 30'x30'.
As soon as the weather is good I plan to plant a lot of the bulbs out (the ones that have produced!) then use it mainly for veg and bringing seeds on.
Great picture
Sun through glass can damage plants and if it gets to hot they will stop growing-hence the need for shading to keep the temperature down-sound a bit peverse but the light can still get through.
You can buy shading paint that goes clear in the rain.
Depending on where the greenhouse is situated dictates if you need to shade all over -does it get sun all day?
I would remove the bubble wrap it is not need at this time of year.
Just a pedantry note-forgive me-dahlias are not bulbs but tubers-there is a difference
Thank you - and you are forgiven
I bought a varied collection with a bit of everything in it. All I know is that there is a difference in shape and tubers should be dug up, dried off and overwintered whereas bulbs can stay in the ground. I need to get my head in the books.
GH is on the East side of a North facing garden (facing West) so as you look at it the back and left side are up against fencing so I only need to really worry about the front and side I think. As much as I don't like the sound of it I think I'll put the shading material inside rather than paint outside. Because I'm looking at it all the time I want it to look relatively tidy otherwise my OCD will kick in
Shading material goes on the outside-a cheap alternative is watered down white emulsion-
(but I don't think you are going to like that
)
errr, you are correct
I'll definately look into it, thank you.