Category Archives: Arborist

FGAR Arborist Report

The Arborist’s Report

Grand Army of the Republic Cemetery Park

Tree Inventory and Analysis

An inventory count and inspection of all trees 6″diameter or greater is conducted at the Grand Army of the Republic Cemetery Park. This report contains significant information to tree health and vitality.
The table below and narrative includes:
i. Plant name (common and specific epithet [genus and specie]).
ii. Plant size (plant height, canopy width and stem caliper- DBH or diameter measured 4.5 feet from the ground).
iii. Condition rating of 10%-100% reflecting current condition and useful life remaining. Higher numbers signify a better condition and a longer remaining useful life.
iv. Specific comments pertaining to current condition.
v. Recommendations of care.
#Common NameSpecific NamedbhheightwidthcondCommentsPruningSprayOther
1Red mapleAcer rubrum320685%Wound at base of stem.
2Kwanzan flowering cherryPrunus serrulata 'Kwanzan'23223545%CBT, suckers at base of stem, deadwoodXXPrune suckers from base of tree.
3English oakQuercus robur25505580%Aphid infestation, deadwood, girdling root.XCut visible girdling roots at rootcrown.
4Southern red elmUlmus serotina11353060%Very asymmetric structure.Prune oak (#5) to create canopy space for elm.
5English oakQuercus robur39807070%Double leader with included bark. Objects in tree.XRemove objects from tree. Monitor included bark. Prune to make space for elm.
6English oakQuercus robur32657570%Girdling root, deadwood.XCut 2" girdling root on SW side of trunk.
7Bigleaf mapleAcer macrophyllum34705070%DeadwoodX
8English oakQuercus robur23655060%DeadwoodX
9Sawara cypressChamaecyparis pisifera13402530%Suppressed by oak #11.Remove tree.
10Sawara cypressChamaecyparis pisifera11352030%Suppressed by oak #11.Remove tree.
11Red oakQuercus rubra32908070%Deadwood, girdling root on east buttress.XCut girdling roots at buttress on east side of trunk.
12Dutch elmUlmus x hollandica30707050%Leaf miner insect damage, suckers.Thin suckers along trunk.
13Bigleaf mapleAcer macrophyllum36806050%girdling root on buttress on SW side.XCut 2" girdling root on SW side of buttress.
14Dutch elmUlmus x hollandica20703050%Deadwood.X
15Dutch elmUlmus x hollandica30906050%DeadwoodX
16Mt. AshSorbus acuparia21404035%Deadwood, stem decay, girdling roots.Remove tree.
17Red oakQuercus rubra38909570%DeadwoodX
18Douglas-firPseudotsuga menzeseii94018100%
19Dutch elmUlmus x hollandica26804550%Deadwood, double leader.XMonitor double leader with included bark.
20Dutch elmUlmus x hollandica28805050%
21Sawara cypressChamaecyparis pisifera14,23601870%Single canopy with #22.
22Sawara cypressChamaecyparis pisifera20601870%
23Dutch elmUlmus x hollandica24704050%DeadwoodX
24Dutch elmUlmus x hollandica25704050%DeadwoodX
25Dutch elmUlmus x hollandica30704050%DeadwoodX
26Dutch elmUlmus x hollandica38605020%Deadwood, tree in decline. DED potential.Prune ivy and suckers from base.
27Sugar mapleAcer saccharum52512800%Wound at base of stem.Recommend rootcrown excavation to assess girdling root potential.
28Sugar mapleAcer saccharum6302590%Girdling root, 18" trunk wound.ditto
29Sugar mapleAcer saccharum7302590%Girdling root.ditto
30Sugar mapleAcer saccharum8353090%Crossing limbs, spatial competition with #31XDitto. Prune to remove crossing limbs.
31Common horsechestnutAesculus hippocastanum9302590%Girdling trunk wound, spatial competition with #30.Remove tree
32Yoshino flowering cherryPrunus yedoensis30305040%CBT, suckers at base of stemXX
33Yoshino flowering cherryPrunus yedoensis36303540%CBT, suckers at base of stem, deadwoodXX
34Kwanzan flowering cherryPrunus serrulata 'Kwanzan'13301050%Tree leaning, no visible buttress flare, internal decay.Remove tree.
35Colorado sprucePicea pungens7401650%Declining condition
36Colorado sprucePicea pungens11352065%
37Kousa dogwoodCornus kousa3121890%poorly rooted.Recommend regular watering during summer months.
38Sycamore mapleAcer pseudoplantanus16,18,18606080%aphid infestation.
39Lawson cypressChamaecyparis lawsoniana12601270%
40Lawson cypressChamaecyparis lawsoniana 'glauca'16401470%
41Lawson cypressChamaecyparis lawsoniana 'glauca'14401470%
42Sycamore mapleAcer pseudoplantanus12503570%
43Pacific dogwoodCornus nuttallii8451260%
44Colorado sprucePicea pungens16501250%
45Colorado sprucePicea pungens15501640%Declining condition. Ski fastened to trunk.Remove ski from tree.
46Moss cypressChamaecyparis pisifera 'Squarrosa'18,13404560%
47Lawson cypressChamaecyparis lawsoniana16,9904070%Single canopy with #48 & 49.
48Lawson cypressChamaecyparis lawsoniana16
49Lawson cypressChamaecyparis lawsoniana30
50Lawson cypressChamaecyparis lawsoniana21903070%Single canopy with #51 & 52
51Lawson cypressChamaecyparis lawsoniana12,9
52Lawson cypressChamaecyparis lawsoniana16
No trees are recommended for removal based on current hazard potential. Native trees include Bigleaf maple, Douglas-fir, Pacific dogwood and Mountain ash.

Tree Count at GAR Cemetery Park

Common NameSpecific NameQuantity
MaplesBigleaf MapleAcer macrophyllum2
Sycamore MapleAcer pseudoplantanus2
Red MapleAcer rubrum1
Sugar MapleAcer saccharum4
HorsechestnutCommon HorsechestnutAesculus hippocastanum1
CypressLawson CypressChamaecyparis lawsoniana7
Blue Lawson Cyrpress Chamaecyparis lawsoniana 'glauca'2
Sawara CypressChamaecyparis pisifera4
Moss CypressChamaecyparis pisifera 'Squarrosa'1
DogwoodKousa DogwoodCornus kousa1
Pacific DogwoodCornus nuttallii1
SpruceColorado SprucePicea pungens4
Flowering CherryKwanzan flowering cherryPrunus serrulata 'Kwanzan'2
Yoshino flowering cherryPrunus yedoensis2
Douglas FirDouglas FirPseudotsuga menziesii1
OakEnglish OakQuercus robur4
Red OakQuercus rubra2
Mountain AshEuropean Mt. AshSorbus aucuparia1
ElmSouthern red elmUlmus serotina1
Dutch elmUlmus x hollandica9

Summer Irrigation

The young trees are suffering most from lack of summer water, specifically the red maple, sugar maples and the kousa dogwood. I recommend regular supplemental watering through the dry summer months, at least every 10 – 14 days. Water to a soil depth of 12 inches.
I recommend avoid watering near the cypress trees during summer months. Pythium and phytophthora, two deadly soil borne fungi, are encouraged by summer watering and particularly enjoy trees in the genus Chamaecyparis.

Turf and Mower Damage

Mower damage has occurred on the trunks of some of the trees. To avoid this, and to create a more root-friendly growing site, I recommend removing turf in a circle around the trees and mulching with wood chips 3-4 inches deep. As a guide, create the circular turf-free zone as large a diameter in feet as the tree’s trunk is in inches.

Pruning Recommended: What Does it Mean?

Pruning is recommended for several trees in the attached spreadsheet. Nearly all the pruning needed is the limited to the removal of dead limbs two inches in diameter and greater. The potential for deadwood falling and hitting a park user is the biggest hazard currently identified by this inspection.

Hazard Trees

A small handful of trees have included bark at branch attachments. When the bark of adjacent branches or stems is included, it prevents a structurally stronger wood-to-wood attachment. The amount of included bark identified in the inspection is a slight amount for each tree and currently does not pose a significant hazard from failure potential. Monitoring is recommended.

Insect

Cherry bark tortrix (CBT) is an insect new to this region. (Attached is a fact sheet that will provide more details about this pest.) The larva of this moth feed in the bark of trees in the genus Prunus. This includes the English laurel along the north of the park, and the Portugal laurel hedge surrounding the cemetery, which are both in the cherry family. The current CBT infestation is limited to the flowering cherry trees. If the population soars, the moth begins to lay eggs in the laurels.
There is currently no biological control available. The recommended chemical control is the insecticide Talstar or Tempo applied to drench the frass tubes (see fact sheet) during the first week of October. Repeat applications are made as needed every 3-5 years.

The Elm Trees

The elm trees growing in this park are unlike any other elms in the region. According to Arthur Lee Jacobson, who has been studying these trees since the 80’s, they are genetically separate individuals and not clones of a single cultivar.
Aside from their historic significance in their placement in this park, it is possible that their genetics may play a role in Dutch elm disease (DED ) resistance.
Currently Seattle Parks and Recreation Department are treating the elm trees for DED.
Some of the elms prefer to grow low branches along their trunks. I recommend retaining some low limbs on these trees, rather than trimming them clean.

Arborist’s Survey

#Common NameSpecific NamedbhheightwidthcondCommentsPruningSprayOther
1Red mapleAcer rubrum320685%Wound at base of stem.
2Kwanzan flowering cherryPrunus serrulata 'Kwanzan'23223545%CBT, suckers at base of stem, deadwoodXXPrune suckers from base of tree.
3English oakQuercus robur25505580%Aphid infestation, deadwood, girdling root.XCut visible girdling roots at rootcrown.
4Southern red elmUlmus serotina11353060%Very asymmetric structure.Prune oak (#5) to create canopy space for elm.
5English oakQuercus robur39807070%Double leader with included bark. Objects in tree.XRemove objects from tree. Monitor included bark. Prune to make space for elm.
6English oakQuercus robur32657570%Girdling root, deadwood.XCut 2" girdling root on SW side of trunk.
7Bigleaf mapleAcer macrophyllum34705070%DeadwoodX
8English oakQuercus robur23655060%DeadwoodX
9Sawara cypressChamaecyparis pisifera13402530%Suppressed by oak #11.Remove tree.
10Sawara cypressChamaecyparis pisifera11352030%Suppressed by oak #11.Remove tree.
11Red oakQuercus rubra32908070%Deadwood, girdling root on east buttress.XCut girdling roots at buttress on east side of trunk.
12Dutch elmUlmus x hollandica30707050%Leaf miner insect damage, suckers.Thin suckers along trunk.
13Bigleaf mapleAcer macrophyllum36806050%girdling root on buttress on SW side.XCut 2" girdling root on SW side of buttress.
14Dutch elmUlmus x hollandica20703050%Deadwood.X
15Dutch elmUlmus x hollandica30906050%DeadwoodX
16Mt. AshSorbus acuparia21404035%Deadwood, stem decay, girdling roots.Remove tree.
17Red oakQuercus rubra38909570%DeadwoodX
18Douglas-firPseudotsuga menzeseii94018100%
19Dutch elmUlmus x hollandica26804550%Deadwood, double leader.XMonitor double leader with included bark.
20Dutch elmUlmus x hollandica28805050%
21Sawara cypressChamaecyparis pisifera14,23601870%Single canopy with #22.
22Sawara cypressChamaecyparis pisifera20601870%
23Dutch elmUlmus x hollandica24704050%DeadwoodX
24Dutch elmUlmus x hollandica25704050%DeadwoodX
25Dutch elmUlmus x hollandica30704050%DeadwoodX
26Dutch elmUlmus x hollandica38605020%Deadwood, tree in decline. DED potential.Prune ivy and suckers from base.
27Sugar mapleAcer saccharum52512800%Wound at base of stem.Recommend rootcrown excavation to assess girdling root potential.
28Sugar mapleAcer saccharum6302590%Girdling root, 18" trunk wound.ditto
29Sugar mapleAcer saccharum7302590%Girdling root.ditto
30Sugar mapleAcer saccharum8353090%Crossing limbs, spatial competition with #31XDitto. Prune to remove crossing limbs.
31Common horsechestnutAesculus hippocastanum9302590%Girdling trunk wound, spatial competition with #30.Remove tree
32Yoshino flowering cherryPrunus yedoensis30305040%CBT, suckers at base of stemXX
33Yoshino flowering cherryPrunus yedoensis36303540%CBT, suckers at base of stem, deadwoodXX
34Kwanzan flowering cherryPrunus serrulata 'Kwanzan'13301050%Tree leaning, no visible buttress flare, internal decay.Remove tree.
35Colorado sprucePicea pungens7401650%Declining condition
36Colorado sprucePicea pungens11352065%
37Kousa dogwoodCornus kousa3121890%poorly rooted.Recommend regular watering during summer months.
38Sycamore mapleAcer pseudoplantanus16,18,18606080%aphid infestation.
39Lawson cypressChamaecyparis lawsoniana12601270%
40Lawson cypressChamaecyparis lawsoniana 'glauca'16401470%
41Lawson cypressChamaecyparis lawsoniana 'glauca'14401470%
42Sycamore mapleAcer pseudoplantanus12503570%
43Pacific dogwoodCornus nuttallii8451260%
44Colorado sprucePicea pungens16501250%
45Colorado sprucePicea pungens15501640%Declining condition. Ski fastened to trunk.Remove ski from tree.
46Moss cypressChamaecyparis pisifera 'Squarrosa'18,13404560%
47Lawson cypressChamaecyparis lawsoniana16,9904070%Single canopy with #48 & 49.
48Lawson cypressChamaecyparis lawsoniana16
49Lawson cypressChamaecyparis lawsoniana30
50Lawson cypressChamaecyparis lawsoniana21903070%Single canopy with #51 & 52
51Lawson cypressChamaecyparis lawsoniana12,9
52Lawson cypressChamaecyparis lawsoniana16