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ARNOLD ARBORETUM HARVARD UNIVERSITY ARNOLDIA A continuation of the BULLETIN OF POPULAR INFORMATION VOLUME XXIII 19633 , PUBLISHED BY THE ARNOLD ARBORETUM JAMAICA PLAIN, MASSACHUSETTS ARNOLDIA A continuation of the ’ BULLETIN OF POPULAR INFORMATION of the Arnold Arboretum, Harvard University VOLUME 23 JANUARY 18, 1963 NuMe~;a 1 TRIAL PLOT FOR STREET TREES the spring of 1951 a trial plot of eighty small ornamental trees was plantedDI~ RING on the Case Estates of the Arnold Arboretum in Weston (see .9rnoldia 16: (B~ 9-1.5, 1906~. A few of these were not happy in their location and promptly died, or did so poorly as to warrant their removal. A few new varie- ties were added to the original group, but for the most part these trees have been growing there s~nce the trial plot was first laid out. The collection has been of special interest to home owners in the suburban areas of Boston, who naturally are interested in small ornamental trees. It has also been of considerable interest to the tree wardens of various towns throughout New England, for here one may see many of the best small trees growing side by side, so that comparisons can be easily made. Recently this plot has been of interest to the Electric Council of New England, a group of utility companies which provide various electric services for the public in addition to stringing electric lines for these services. When the right kinds of trees are planted properly in the right places along the streets and highways, there need be but little competition between the trees and the wires. Today these companies are employing arborists to help the public in this very type of intelli- gent planting. As an outgrowth of this new interest on the part of the electric companies, a booklet was published in 1960 by the Electric Council of New Eng- land. This is entitled, "Trees in Your Community," and 1.50,000 copies have already been distributed throughout the New England area. A few copies are still available and may be obtained from the local member electric companies of the Electric Council of New England. While the booklet was in process of preparation the Arnold Arboretum was asked to make suggestions as to the trees which should appear in the final list. After the booklet was published and widely distributed, Mr. George Wignot of the Boston Edison Company requested the Arboretum to consider the possibility of adding to our Trial Plot of Street Trees those mentioned in the booklet which [ 1] Were not already growing in this plot. Stimulated by this interest on the part of the Boston Edison Company and aided in acquiring some of the trees which we did not have, we enlarged this trial plot so that with the exception of four, it now includes all of the trees recommended in the booklet. Those four will be added as soon as they can be obtained. Some of the trees growing in this plot since 19~ 1 are now excellent specimens ; those just planted last fall need a year or two of growth to demonstrate their true worth. In any event, the following list indicates the trees now growing in the trial plot. They include all but four of those in the booklet, "Trees in Your Community," plus seventy others which have merit under certain specific condi- tions. Three-fourths of them are under thirty-five feet in height, excellent sub- jects either as ornamentals on the small lot or as street trees. All in all, 109 species and varieties of trees are now growing in this Trial Plot. Since these are among the best deciduous trees available for ornamental plant- ing, every home owner and tree warden might gain much information by visiting this plot at some time during the year. On page 8 of this bulletin there is a map showing the location of the Trial Plot for Street Trees, on the grounds of the Case Estates of the Arnold Arboretum in Weston. This Plot in Weston is off Wellesley Street which runs between Routes 20 and 30. Rows are numbered from the road bordering this plot, the first numbers being at the southeast or Wellesley Street end of the rows. *= Trees under 2.5 feet tall at maturity. ~=Trees over 35 feet tall at maturity. X = Hybrid. - -. z~ ] 00 a, ci ~ < E II> v ~ uÕ ea :i8 c0 « _c .8a 0 II> 1~Fn 0 ..c h b_ O C Fn « H II> ..c M ~ o· N SII> N© a ~x ~ W ,cn ~a$ S 0~ U x ~ ‘m a~4i ‘~ °’ o’" c :~ II> ~ ’G ,°~, m E· ’:> .~ ~o a~ c c~. ’"m rv~ Sv 7r ~U W0 ~ CL’G _OII> ~" G C C" ’" S b+~L w ’O O C F" GI c ro 0 G II> s F ’"y G A ’" ~ .’t G, ’" G 3 G 0/) .v F w w G ’" v rII> ;;. 4~ W., ~-G H0 <’;°= ~ s OI ,~m Y II> cd ’" ro :u a ? 0 ’" ,C ~o .~ du a~ .. c 0 xaa ’" " <iU o~.... Ga0 ~. ~.... [6: DONALD V~’YMAN .N Wcn ,~S’ ~ ~ ~po~ N~ G~ i rrm o "’~~ "d"J’ m. ",s ~-, ~ C "b t~o cWn ~J" o~ ~ o d~ 7M r; ~. ’~ °C~1 y .b o 0 fl., j0 y ~3~~~~g~ ~-g.M’ ~j~."’ OG. f7 ~-~t V (~D CrJ N §g§-~S ~0 ~a;J?~SP? ‘C CT ~ r/ no. W. O_ ‘a° ~o ~.k ,z1" W~ NG m~ ’n~~~.°c~c~~c ~’ a. ~W r: w .. ’ S- ~~° ~~C ~ o ro ;n m c~s o ’2: ’’ ., ’~00 °’ S~ E ~ ~ "G zw ~ o~ ~ ~ ~ r a ’ o C~7 p W ~° c~c ~° ~ .P :,oa. ~~ .~ a.o°~ ~ !L~ ~i!_,- a. ~ N ‘C N Pt U7 · .N. n p=.- O 3 P> (~ CD ’P O ~-~! (n ~ 0G Q, ~,. ~ cD f~y ~ ~ X S’ No- a- ° " ~& a. 0 a <T a*~ 3 N ~ N G. O· 9L~-~t 03~s’?S ’ ."3^: v f’C7D S~S ~ O~. Cn · ".’ c~pN y ‘J 0O O. °o n ~ m o ~~sr~~° o .y ~ ~’ ·s 0 wft Nw ~ 3= ~ o’~ ~ d. ° ~ o, Np ARNOLDIA A continuation of the BULLETIN OF POPULAR INFORMATION of the Arnold Arboretum, Harvard University VOLUME 23 FEBRUARY 22, 1963 NumsEe 2 RESULTS OF TRIALS IN THE GROUND COVER DEMONSTRATION PLOTS Ground Cover Demonstration Plots on the Arnold Arboretum’s Case /71HEi Estates in Weston, Massachusetts, were first laid out in 1950. Then, only about fifty different kinds of plants were tried, but as time went on, there was so much interest shown in these plantings that they were increased considerably. New ones are being added every year, and unfortunately, there are always some which do not do well and die as a result of severe winters. It is impossible to publish a list that is complete for any length of time, since numerous changes are constantly being made. There are at least 165 different kinds of plants being grown in these plots now, and most of these are listed in this bulletin according to row number and position in the row. Row 1 is nearest to the high stone wall, and the plants are numbered from the Wellesley Street end, the first plant in each row being the closest to Wellesley Street. The plots are in an open former cow pasture, mostly in the full sun, although the first row along the taller stone wall does receive shade about half the time. Otherwise, these plants are all given approximately the same care, with only a few being covered in the winter with pine boughs. Late fall and winter are not the best times of the year to see these plots. Rather a visit might best be made in late spring after many of the plants have made a major amount of growth and while many of them are still in flower. This list is published now so that the arm-chair gardener who makes plans during the winter for next spring’s gardening activities, can become acquainted with the fact that this demonstration plot exists and is open to the public at all times. All the plots are labeled with the common and scientific name of each plant. It is here that one might come when in doubt as to just which ground cover to select for a certain area. 9J GROUND COVER DEMONSTRATION PLOTS, CASE ESTATES (As of January 1, 196~) h=herbaceous, usually dead above the ground every winter e=evergreen foliage *=these have proved good ground covers in these trials 10] _11 J 12~ [ 13] Unsatisfactory Ground Covers (These have not proved successful in the Trial Plots of the Arnold Arboretum at the Case Estates during the last ten years.) Acaena buchananii - died the second year. Ajuga genevensis rosea - beautiful in flower, but does not spread well. Ajuga reptans ’Variegata’ - exeellent for ~?-3 years ; then the species seeds in and must be removed by hand. Alyssum saxatile - poor as ground cover. Arabis alpina - must be replaced every few years. Arenaria montana - dead 1960. Arenaria stricta - poor, clump-like growth. Arenaria maritima - 1951 - died out before 1962. Armeria montana - does not spread well, plants show dead spots in center after a few years. Artemisia stelleriana - too coarse in texture. Asperula hirta - removed after one year, poor as a ground cover. Asperula odorata - died m 3 years. Situation too dry and hot. .Athvrium filix-femina - only satisfactory in shade and moist soil. Aubretia deltoides hendersonii - died in 2 years.