440 On trimming Hedges. 



periment even so late as the first of March, with suc- 

 cess. The haws will not vegetate, if sent to any dis- 

 tance in the pulp, as Mr. Kirk knows, to his cost and 

 disappointment. It is probable that the alternate 

 freezing and thawing of the Newcastle thorn f Crataegus 

 cms gain J will also expedite their vegetation : they 

 require to lay in the ground two winters before they 

 vegetate. 



Mr. Kirk stated to me further what may be of great 

 consequence to the success of a hedge, viz. the injuri- 

 ous effects of the common black walnut tree upon it. 

 One of those trees that stood at the distance of 15 feet 

 from a hedge three feet high, killed three pannel of it. 

 Another walnut tree only three inches in diameter at the 

 root, also killed six thorn plants, and at the above dis- 

 tance : both trees stood directly opposite to the hedge 

 they blighted : on removing the walnut trees, the 

 hedge grew well : — whereas an apple tree that shaded 

 a part of the hedge was not found injurious to it. 

 Cedar trees likewise are injurious to hedges, from the 

 farina which is so abundantly discharged from them, 

 settling on the leaves of the plants. 



