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12 messages
04/07/2013 at 18:50

I have been struggling with spots on my hollyhocks and this has also now gone to the stems and the leaves are starting to lace through. 

 

Does anyone know how to fix this, I tried to start removing the infected leaves but it now seems to have hold of both plants in total. They are 2 yrs old now and just about to flower!

will this spread to my other perennials. Any home treatments or do I need to bury something strong. Help me please I'm petrified of losing my gorgeous flowers and it will be so sad. I can take pictures if you need. Thanks

04/07/2013 at 19:12

The good news is that this proves you have excellent air quality - the problem doesn't occur in heavily polluted areas!  It won't spread to anything else but other hollyhocks.  The bad news is that there's nothing you can really do.  I love hollyhocks but cannot grow them any longer as they get devasted by hollyhock rust every time now.  It might be worth looking for resistant varieties but I've just had to give up.

04/07/2013 at 19:21

They aren't very long lived perennials Red Dahlia and always seem to succumb to rust, have you thought about collecting seed from them and sowing that to keep them going.  I have some double ones growing in my garden that were sown from seed last year, I have no idea what colour they are but I'm going to save seed.

04/07/2013 at 19:41

first time growing them and they look atrocious last year and worse this. There is a black and a mixed colour one. Never seen a flower yet so not sure if they will actually maybe it to the full bloom this year. My mum has given me some fungicidal powder to make a spray for rust but is it worth a go or shall I give up and watch them degrade??

04/07/2013 at 19:44
04/07/2013 at 19:48

It's worth giving the fungicide a chance as you have it there, it will either work or not   Mine are planted in full sun, this is the first year they will have flowered, at the minute they have no rust symptoms but I won't be surprised if it appears next year.  Might be worth giving them a general liquid feed as well to give them a bit of a boost.

04/07/2013 at 19:54

I agree with Paula - nothing to lose in trying the fungicide.  They look close to flowering which will take the eye away from the leaves.  If you try and grow them again next year, best to try a different spot in the garden - you might be lucky!

04/07/2013 at 21:38

 i have grown them for years,  and this year they are free of rust! 

  But they have been attacked by snails!!   so one blight or the other!!

when i  rust on leaves i just removed them,didnt seem to effect the flowers.

 

        ( just make sure the fungicide won't harm insects )

04/07/2013 at 21:48

I don't grow them anymore because they get decimated with rust I have one plant just outside the garden wall which will flower this year, it's not doing too bad but has a little rust on it.

They've come this far think it's worth a go and treating them

04/07/2013 at 21:56

Thanks all. Everything had a liberal treating of chicken pellets about 2 months ago. So shall I reapply or feed the garden again?

should I completely cut them off when flagged and see what happens next year?? never had hollyhock before so clueless, I left them completely last year and some leaves made it through winter! I did mulch with spent compost to protect from frost but only half an inch. 

04/07/2013 at 22:21

My understanding is that they are biennual plants so once they flower that's it, their life cycle is complete. I think they are fully hardy so any plants grown from seed this year, will withstand the winter and flower next year, Not sure what you mean by flagged..........do you mean when the flowers are over and seeds are forming?

I've known some that self seed so almost become perennial.

Out of interest the leaves that made it through, are they the ones that are due to flower soon?

You can collect seeds once they have flowered, I would sow them straight off the plant once they are dried enough, that way you should be able to plant them out before the first frost and they will grow next year.

Hope that helps a bit

 

04/07/2013 at 22:43

Hollyhocks are perennial and can last for several years, but are best grown as a biennial due to problems with rust. You can try to keep rust in check by removing and  safely discarding infected leaves.  In autumn, cut completely to ground level, discard all old flowers and move any fallen leaves completely away from around plant.  If your. plant has rust, then avoid using any seed.  Rust is worse in wet summer.  Dont plant hollyhocks too close together - good air circulation will help control rust.

Fungicides can be used to control rust, but it needs to be sprayed regularly of at least twice a week.

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