Jonathan F.

Dionaea summer problems.

18 posts in this topic

Posted (edited)

This is another problem I only have in summer with my venus fly traps they get smaller and smaller and less leaves till the growth comes to a stop.In Autumn and Winter they are beautiful red traps and lots of growth if someone could help me with a problem that would be great.

IMG_20170706_160407__1499358439_82.21.193.64.jpg

Edited by Jonathan F.

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What are they potted up in?

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5 hours ago, Alexis said:

What are they potted up in?

They are in shamrock peat moss and perlite at 50/50 mix.I only have this problem in mid summer.

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Are they in a g/h or outside?  Some of mine go into 'rest mode' when the temperature gets high (30+) in the g/h, some don't, never worked out why.  The spring flush of traps seems to be on die back and the next ones are slower to appear.  Some don't seem to do this but as long as I can see new traps coming I don't worry too much.  Mine are all in the peat/sand mix so no variation there - they can be in the same trays too.

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1 hour ago, Dunc said:

Are they in a g/h or outside?  Some of mine go into 'rest mode' when the temperature gets high (30+) in the g/h, some don't, never worked out why.  The spring flush of traps seems to be on die back and the next ones are slower to appear.  Some don't seem to do this but as long as I can see new traps coming I don't worry too much.  Mine are all in the peat/sand mix so no variation there - they can be in the same trays too.

Mine looks like the photo above all summer until the spring when they burst back into life. So next year I might shade the greenhouse a little over the summer months and see what happens.

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Very strange. I assume you're using rainwater.

Have they always been in the same part of the greenhouse?

 

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Things I would check that could cause it:

Plants kept too wet - try them drier.

Too Hot - keep below 30*C

Peat with nutrients (Shamrock is usually OK, but I have had bad batches from them in the past)

Water contains dissolved salts - test it.

Combination of any above.

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2 hours ago, Alexis said:

Very strange. I assume you're using rainwater.

Have they always been in the same part of the greenhouse?

 

Yes using rain water at 6ppm for all my other cp as well.

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1 hour ago, Trev said:

Things I would check that could cause it:

Plants kept too wet - try them drier.

Too Hot - keep below 30*C

Peat with nutrients (Shamrock is usually OK, but I have had bad batches from them in the past)

Water contains dissolved salts - test it.

Combination of any above.

Been checking all you said and the only thing I can see is the temperature in the greenhouse as been at 42c over the last few weeks, so with them being in black pots as well it looks like heat stress?

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Maybe shade them during the hottest part of the day?

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Mine get through scorching temperatures with no issues. 

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So if it's not the temperature at this time of the year,what could it be?

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Maybe try buying a ready potted VFT (Hampshire Carnivorous Plants sell them in pots) and just keep it with the rest. If it declines you've got environmental or water issues. If it thrives you have problems with your media.

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Hi Jonathan, What percentage of your VFT's do this? Also have you noticed if it happens more to the ones at the edges of the trays like the plant in your picture above?

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On 13/07/2017 at 11:15 AM, Trev said:

Hi Jonathan, What percentage of your VFT's do this? Also have you noticed if it happens more to the ones at the edges of the trays like the plant in your picture above?

I would say about 80% of my Venus flytraps do this each summer. Plus it's more the outer Edge venus fly traps what is more affected in Mid summer.

I use rain water only, plus shamrock peat moss and horticultural perlite only at 50/50 mix, I have noticed the thermometer in the greenhouse has hit 47 degrees over the last few weeks, as the greenhouse is in full sun from morning till sunset.

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Hi Jonathan do you have any fans set up to help with air circulation?  I have some small ones running 24/7 with bigger ones kicking in when the temp goes above 20C.  If you don't have room or a power supply (or fans) you could try temporarily removing a couple of panes of glass during the summer.  I've had to do that in my cactus house, removed the glass, covered with netting to keep birds out, bought slightly oversize 2mm Perspex to cover temporarily on cool days and 5mm Perspex to replace the glass in winter (as it's easier to handle than glass).  All worth a try if the budget will extend that far.

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5 hours ago, Jonathan F. said:

I would say about 80% of my Venus flytraps do this each summer. Plus it's more the outer Edge venus fly traps what is more affected in Mid summer.

I use rain water only, plus shamrock peat moss and horticultural perlite only at 50/50 mix, I have noticed the thermometer in the greenhouse has hit 47 degrees over the last few weeks, as the greenhouse is in full sun from morning till sunset.

I used to get it happening to the pots at the edges of my trays, so I put some pieces of white plastic over the sides and it stopped happening. I believe it's caused by the black plastic pots making the media heat up, Dionaea seem to like cool roots. It also seems to cause more evaporation from the pots leaving behind any dissolved salts which gradually concentrate in the surface, how often do you replace the peat/perlite? I have to change mine every year because I live next to the Atlantic ocean so even the rain is salty.

As Gaz says, I would try more ventilation. Aim to keep the temp under 35*C, and put something white around the edge of the outer pots. Good luck.

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I grow mine in tall pots so the media stays cooler, and the roots can grow longer.

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