[Western]

I have a lovely hedge of mixed Ash and Hawthorn, which I'm very fond of.
However, my 'leader' wants one particular Ash and a Hawthorn severely cut back, as they're blocking the light into the kitchen. Reluctantly, I've agreed (since it'll save others from the same fate).
So, help please.
When is best to cut back - autumn or spring ? Is it important to cut trunks diagonally, rather than striaght across ? Should I apply some kind of sealant to the cut to protect the trees from disease or death ? Any help please. The diameter of both is ca. 8 - 10 cm, so not big or old trees. Thanks.

[Belfast]

" Crataegus (hawthorn, May)

The ideal time to prune hawthorn is once the fruit has been eaten by resident birds and other garden wildlife, but before early spring. Most forms require minimal pruning, other than the removal of broken, diseased or crossing branches. Encourage them to form a single-leader standard tree by removing lower branches as the tree matures until there is a clear trunk about 2m high. Alternatively, cut back a recently planted hawthorn to encourage it to produce a multi-stemmed tree ideal for use in a naturalistic planting or wild area of the garden. Trim hedges in summer. "
http://www.horticulture2.co.uk/tips.html

How to prune your plants properly
http://www.wonderhowto.com/how-to/video/how-to-prune-your-plants-properly-14998/

[kindredspirit]

I think you can "massacre" Ash & Hawthorn anytime of the year.

They'll shoot back regardless.

No need to seal the cuts on these.

(Just my humble opinion.)

[Foxylock]

Would coppicing be a possibility ?

[michael brenock]

kindred spirit is right the Ash and hawthorn are both hardy specimens and could be cut at any time but best done between November and March. No need for a sealant and sloped cut is better than horizontal.
michael brenock horticultural advisor (retired)

[Western]

Thanks folks.

[James Kilkelly, was GPI.]

It's worth having a read of this ....... Good Advice for Pruning Wind Damaged Trees