You may be over-feeding it. I also have heavy clay that I amended
with peat moss. Clay has a lot of nutrients already in it, so I'd cut
back on the foliar feeding for a while. Last year's growth pattern is
about right - roses plateau in the summer, most growth is in the
spring.

On Tue, 6 May 2014 12:03:58 +0200, mike696
wrote:


Hello,

I'm hoping that someone can help diagnose what is wrong with my rose.
Last year I planted this David Austin climbing rose called Madame
Gregoire Staechelin. See link: 'Mme Grégoire Staechelin - David Austin
Roses' (http://tinyurl.com/mxcdd6w).

Our soil type is heavy clay, so I spent considerable time digging in
plenty of organic matter and horticultural grit before planting. This
improved it greatly. On planting I also used the root grow mycorrhizal
fungi. The rose grew well for the first couple of months last year, but
then quickly plateaued out for the majority of the summer, despite being
fed and it receiving 6-7 hours of sunlight. This Spring I treated the
rose for Blackspot & fed it with David Austin rose food in Spring, I
also bought Uncle Tom's Rose tonic to use as a foliar feed spray. After
the Blackspot cleared up, the new growth looked fine, but now the ends
of the leaves are turning brown and curling up. I also can't understand
why it has such poor vigour.

Can anyone explain what this might be and what I'm doing wrong?

Thanks

Mike


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