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Trouble with germination using peat free compost

(43 Posts)
Aely Wed 21-May-25 14:19:12

I was happy when we were told to change to peat free compost as I know the benefit of peat bogs and beds not being destroyed. I had already switched to a low peat mix. The compost last year was pretty much unusable. Barely composted at all and more like a bonfire mix of twigs, grass and other half identifiable detritus (plus the odd stone and bit of plastic). I left most of it available to the Leopard slugs to continue composting over winter but I have had real problems getting seeds to germinate this year, with both old and new compost. Not a single sweet corn seed succesfully germinated and grew, most rotting. Same with peas. Not even pansies have come through, likewise the Curly Kale. I have experimented with adding vermiculite or pearlite to vary the drainage properties and tried multiple sowings. The compost is either bone dry or claggy - or crusty on top and soggy underneath.

I was at RHS Wisley on Saturday and staff there told me they have the same problems, so it's not just me. Any ideas for next year's attempts?

Aely Sat 31-May-25 12:48:52

Ah, Blackfly. Taking the tender tips out of plants is useless. The little beggars haave totally invaded my broad beans, aphids on top of aphids from tip to root. I am loathe to use soapy water as I have heard it kills worms and we have few enough of those in our sandy soil. The dry weather has definitely caused the birds to redouble their efforts on my ripening red currants, for the moisture, but that is ok so long as they leave me some on the lower and more hidden branches.

BlueBelle Fri 30-May-25 19:19:43

No no messages on my allotment either Aely
Certainly not weather for me Esmay as I start them all off in my conservatory I have got plenty of plants now but they were incredibly slow and some I had to sow twice

Esmay Fri 30-May-25 10:54:52

I'm also experiencing really poor germination .
I started planting seeds as a four year old and was thrilled at the results .
Now in my early seventies with what is considered good gardening knowledge and experience I feel like a novice .
I'm using Jack's Magic ,sieved fresh top soil or John Innes and experimenting with mixtures .
I'm also wondering about the weather .
Perhaps this is my last year of planting seeds .
I'm too tired to pffaff (spelling?)around !

Aely Wed 28-May-25 21:40:24

Unfortunately no such messages on the back of our Allotment Shed door. Like my garden, our allotments are tiny (2.5 rods) and no room for compost making. Good news is, with the Irish compost I mentioned earlier, I have 2 tiny sweetcorn shoots poking through and hopefully more to come, although it might be too late to get a crop before winter arrives.

Churchview Mon 26-May-25 20:59:36

To those grans who can't drive - our allotment has an advert up for a lady who delivers compost/manure/bark etc to your door.
She's a one man band and her prices are really reasonable. I wonder if it might be worth seeing if you might have someone who provides a similar service in your area?

Clematis46 Mon 26-May-25 18:37:55

Melcourt Sylvagrow is the only peat-free seed compost to work for me. Monty Don in GW magazine advocated making your own but it’s only viable if you have access to leaf mould as it includes this as well as vermiculite, loam and garden compost. I hope this is correct as I’m currently in France and the relevant GW magazine is at home!

Jaxjacky Mon 26-May-25 18:28:19

grandMattie and BlueBelle I order all of mine online, have done for a few years

Woollywoman Mon 26-May-25 18:25:30

Yes, Valdavi re greenfly, aphids, whitefly etc! The weather may well be the cause…
Lettuce, rocket, roses, everything really… sigh…

valdavi Mon 26-May-25 18:16:42

Peat free was OK for most things here, but my courgettes didn't germinate. I couldn't find any small plants in the shops either, maybe I wasn't the only one?
My homemade isn't really good enough for seedlings, I use it to mulch (all the sunny spots are on grass & the rats dig under & get in - so I compost on patio & it's shady).
I agree it's really difficult to get the watering right, but I'm glad they don't dig up peat-beds for us gardeners any more.
I am having a torrid time with greenfly, blackfly & whitefly this year (strangely greenhouse is OK) I'm putting it down to the dry weather. Anyone else found this?

Beeb Mon 26-May-25 18:03:56

My daughter works in horticulture. They use Melcourt peat free seed compost. Last year they tried a reduced peat alternative, as were desperate, and got great results. Adding perlite to the mix helps to reduce damp off (a type of fungi that destroys the base of seedlings). Interesting to read other people’s experiences. I might experiment with various mixes of homemade compost and a peat free seed compost.

BlueBelle Mon 26-May-25 17:44:51

I m like you grandmattie no car, live nowhere near a garden centre so ??? A bit snookered and the stuff they are selling in town is sooooo useless I ve put some really tiny shoots outside much sooner than normal but they are growing now they are in real soil !!!

Marleygirl Mon 26-May-25 17:39:17

I agree with all previous letters in that the bag of peat-free compost (costing around a fiver) seems not to be very good. Time is getting late for sowing beans, but now mixing content of the bag with my own compost - no longer have a glasshouse, but am still trying!

grandMattie Mon 26-May-25 17:30:54

I agree with all.
My problem is that I don’t have a garden, only a tiny flower bed and pots. I bought some compost and it’s rubbish. Limited finances and no car. No idea where to go to next.

Stillness Mon 26-May-25 17:11:54

I think it’s rubbish compost. Ideally, you could mix it with your own homemade stuff.

Madmeg Mon 26-May-25 16:28:38

Well, I'm no expert but in recent years I haven't had much problem with seeds. I do use Seed compost and don't mind the price cos I need so little (you don't want it to be "rich", but for the larger veg (toms, cukes, courgettes etc) I use a little electric propagator (kitchen windowsill) that I've had for years. Everything came up quickly this year.

But for the next stage I used Westland Multipurpose (used it for years) and it's taking its time. I even used a bit of tomato food to bring things on but they are still way behind (though look healthy enough.

All is peat free, has been for some years, and it seems to look fine now (after some years of rubbish). I usually aim to get things outside/in the greenhouse by the end of May - which it now is - but most things are still very small.

I am potting up my one cuke into its final pot (doing it in the kitchen cos its tipping down outside!) but I bought that (no point in buying a pack of seeds for one cuke!).

Not really started on the flowers yet, but bought them all in.

My real problem this year (and last) is botrytis on my strawbs. I bought new raised beds last year and all new plants so I am pretty heartbroken. I replanted them all about 6 weeks ago to spread them out more but I don't think it has worked.

Skodadoda Mon 26-May-25 16:09:13

I have had similar problems; the soil seems to be rock solid on the surface and my onion seedlings are simply not growing.

Jeanna Mon 26-May-25 16:09:12

I bought peat free compost as we decided to grow some zinnia and cosmos from seed . Not one germinated. I put some zinnia directly into a large pot with soil and they are doing fine. I won't use peat free again. A gardener I know said they use allsorts of waste and rubbish to add to it . Horrible.

nanasam Mon 26-May-25 15:47:17

My climbing french beans were a disaster in the first sowing in peat free compost so I tried the germination method I saw on a YouTube video. I put 8 seeds on a sheet of wet kitchen roll and sealed it in a zip lock bag. After only 4 days the seeds were starting to show growth. All 8 germinated over the next few days! When they had about 1" of root/stem growth I planted them in individual pots and they've been growing happily since, even in the peat free compost.

janipans Mon 26-May-25 15:42:22

Most of my seeds germinated OK. I mixed peat free compost with a light, sandy seed sowing one about 50/50. Courgettes cucumbers, tomatoes, beans and various flowers doing well. Perhaps I have just been lucky though.

Churchview Mon 26-May-25 15:40:31

I used Sylvagrow multipurpose compost which I mixed with my own leaf mould and some sharp sand. All germinated fine except runner beans, but that's probably my fault for using a three year out of date packet of seeds.

DollyTubb Mon 26-May-25 15:10:51

I use seedling compost, it makes a huge difference to germination rates and healthy seedling growth. I've used peat free compost for a few years for growing on seedlings but I mix it eith my own home made compost 50-50. It makes a big difference but I appreciate not everyone has access to a well rotted home compost bin!

4allweknow Mon 26-May-25 14:32:26

I have mixed seedling compost with topsoil and this year results seem better. Haven't found a peat free I've liked yet. As OP have said seems to be bags of rubbish. Do wo der at tge oeatlands being removed to accommodate the space station in Scotland given all the hype about protecting the environment.

Pattypee Mon 26-May-25 14:11:32

Melcourt Sylvagrow is the best. Not cheap but gets results and holds moisture.

mabon1 Mon 26-May-25 13:44:59

I use Westland Super Fine Seed and Potting Compost, success every year, so many seedling that I feel like lady bountiful giving many to friends.

David49 Wed 21-May-25 21:38:31

You definitely need seedling compost, usually that’s OK the main problem I have is with any compost is keeping it moist not wet.
Any recycled is best used for mulching where mature plants can tolerate some chemical contamination, grass mowings are the worst if you use weed killer on it.