The beauty of spring is all around us, take a moment to enjoy it. Take a walk through any of our coastal canyons, parks and open spaces. You’ll be rewarded!
Back in my college days at Cal Poly Pomona, I took several plant identification courses as part of the educational requirements for Ornamental Horticulture. Two trees from the same genus always stood out for their outstanding floral display and landscape use. Back then, the genus was called Tabebuia, since changed to Handroanthus. The two useful landscape species are Handroanthus impetiginosa,(Pink trumpet tree) and H. chrysotrichus, (Golden trumpet tree).
While taking a walk, I came across a beautiful pink trumpet tree in full bloom. I then started noticing a few other trumpet trees scattered about the neighborhoods in North Park. I’m not to sure why, but in my view, this species is an under utilized ornamental landscape tree. Perhaps due to a slow growth rate, medium appetite for water or its deciduous nature, the species is not heavily promoted by the nursery industry. But it has many beneficial characteristics making it a useful ornamental landscape tree.
The pink trumpet tree requires full sunlight to part shade and grows to approximately 25-feet in height in Southern California. The non-aggressive rooting system makes it a good choice for use in smaller confined planter areas such as a parkway strip. It performs well in the urban environment. Like most trees, it prefers well drained fertile soils however I see this tree flourishing under less than ideal conditions. No noted pests or disease, hardy to 24º F, damaged below 18º F. After spring flowering, it grows a green to brown colored pod.
Unlike the pink trumpet tree, the closely relate golden trumpet tree is a more rapid, larger growing tree. It too is deciduous, and like the pink trumpet, it flowers in the spring with an impressive display of brilliant, fragrant yellow trumpet flowers.
This tree grows to a larger size than the pink trumpet, up to 50-feet tall and similar width. It has a spreading, low canopy that matures into a broad, round-headed or vase shaped crown. It prefers full sun to part shade.
Branch strength is rated as medium to somewhat weak and root growth is more aggressive than the pink trumpet. Unlike the pink trumpet, the golden trumpet tree should not be used in a confined planter are.
Both these trees perform well in our mediterranean climate and their different growth characteristics allow for varied use, one in more confined areas, the other requires more room to grow. Once established, both are relatively drought tolerant.
Hope you find this helpful, let me know if you have any questions!
Such a gorgeous spring day, had to go for a walk through Morley Field and Balboa Park. I knew it would be a busy day with lots of people seeking the beauty and sunshine at the park, so I decided to walk through some of the less visited areas of the park in search of plants.
When your a horticulturist, arborist, landscape contractor and avid gardener, it is kind of a curse and a blessing. I cannot help but be drawn to looking at trees, shrubs, landscape design and contrasting plant foliage and flower colors.
I took a bunch of pictures, some might seem more obscure or leave you wondering what the heck that plant is! Take a moment and enjoy!
Cactus, succulents and natives at Balboa Park
Through a business acquaintance, I had the good fortune to meet with Mr. Christian Rodriguez, a company representative from Blue Drop, Inc. We met at a downtown San Diego street intersection where Blue Drop, Inc. had a contract with the City of San Diego to replace old cast iron tree grates with their new product called Safe Path.
Tree planters within pedestrian sidewalks are typically small confined spaces surrounded by concrete with lots of pedestrian traffic. Tree grates were installed around the planter pit primarily to protect people from tripping over tree roots. The grate also allowed watering to occur beneath the grate and afforded the tree a degree of root protection from pedestrian traffic.
When first installed surrounding a young tree, there is plenty of room for the tree trunk and root collar to grow and expand. Tree grate openings typically are up to 12″ in diameter.
A young tree with a two inch diameter trunk will add one inch of trunk diameter per year. The tree will outgrow the tree grate opening within a decade. Just as the tree reaches maturity and is starting to provide the maximum intended benefits, the trunk begins to lift the tree grate. Either the tree or tree grate must be replaced.
When I met Mr. Rodriguez, he showed me a downtown site where Blue Drop had installed their new Safe Path product. The product is a poured in place permeable rubberized material that levels the planter surface with the adjacent sidewalk. Water quickly infiltrates the permeable product which allows for both water and gas exchange. The tree trunk, root collar and any surface roots are safely protected by the product. As the trunk and roots enlarge, the products cracks, allowing for easy product removal and mending.
Because Safe Path is poured in place, it appears to be an ideal product to retrofit existing planter systems and especially for irregular shaped planter areas. The product provides a smooth, yet permeable surface, creating a safe environment for pedestrians while protecting tree roots and enhancing street scene aesthetics
I have no financial of special interest in Blue Drop Inc or any of their products. As a certified arborist who has provided expert witness testimony in trip and fall cases involving trees, I was interested in discovering new technologies that improve public safety around trees.
Click the link to read the full article reviewing the product. A Better Way to Protect Trees and Pedestrians
The Professional Tree Care Association (PTCA) of San Diego hosted their annual seminar and field day, a two day event on Friday, August 22 and Saturday August 23, 2014. This was the 25th annual event and like many of the previous seminars, this was another informative, educational experience bringing together a wide diversity of speakers and audience!
The seminar was on Friday and this years theme centered on the ongoing California drought and ramifications to trees. There were a number of great speakers, starting with Mr. Ron Matranga who provided an overview about trees in times of drought, current and future water restrictions . Dr. Roger Kjelgren, Professor from Utah State University, provided a simplified method for landscape irrigation demand estimation. Dr. Linda Chalker-Scott, the Urban Horticulture Extension Specialist from Washington State University discussed how to treat and avoid drought stress in landscape trees and Ms. JoEllen Jacoby, the Water Conservation Landscape Architect for the City of San Diego enlightened us about planning for current and future water restrictions (gulp, better get some rain this winter)!
Ms. Mary Matav, Agronomist from Agri-Serve presented information on how to combat pests and drought, followed by Dr. Tracy Ellis, Entomologist with the San Diego County Department of Agriculture, scaring all of us about tree insect interceptions and quarantines in San Diego County.
A great roster of speakers who delivered relevant information in a beautiful setting at Balboa Park in San Diego. On Saturday, the event transferred to the field, where information discussed at the seminar was applied and viewed in the field, an aspect of the field day I find very beneficial.
As usual, Dr. John Kabashima, the Environmental Horticulture Advisor with the UC Cooperative Extension, presented new, current information on the latest insect threat to our ornamental and agronomic trees in California, that being the Polyphagous Shot Hole Borer, (PSHB). As many of us already know, this destructive ambrosia beetle is now active throughout the Southern California.
The PSHB is an invasive ambrosia beetle that carries the fungus Fusarium euwallaceae. The female tunnels through the bark and lays galleries of pre-fertilized eggs and grows the fungus, which becomes food the newly hatched beetles. The fungi infects the tree with a disease called Fusarium Dieback (FD), which interrupts the transport of water and nutrients through the vascular system of the tree. In essence, this is a vascular clogging disease resulting in dieback and death of a large host of trees. Unfortunately, there is no cure at the present time and beware of PSHB/FD look-alikes. Here is very informative attachment Dr. Kabashima provided that really provides current information about this insect. Handout is published from the University of California and the UC division of Agriculture and Natural Resources. PSHB Information
Many thanks to all of the hardworking voluntary staff of the PTCA. What a great local association, I am very proud to be a member of. The PTCA is an active association promoting the best in tree care and tree knowledge. An association composted of tree care companies, certified and consulting arborists and tree care professionals, the PTCA continues to provide current and relevant topics for it’s membership and community at large. Thanks again PTCA, looking forward to next years Seminar and Field Day!
Rappoport Development Consulting Services LLC has been hired by the City of San Diego to provide certified arborist consulting services for the North Torrey Pines Road Median and Street Enhancement project. Estrada Land Planning Inc., the project landscape architectural firm, has sub-contracted with RDCS LLC to implement tree protection plans, including tree monitoring, and best management practices. Tree protection plans and best management practices (BMP’s), are designed to minimize construction impacts to the existing median and parkway street trees.
The project encompasses approximately 1.5 miles of construction work along North Torrey Pines Road, adjacent to the Torrey Pines Golf Course. The scope includes street improvements (curb, gutter, guardrail, sidewalk, drainage) as well as landscape and irrigation within the medians and parkways. Palm Engineering is the General Contractor for the project.
Within the project boundaries, north and southbound traffic is separated by a median, varying in width from approximately 3 to 20-feet. The current median landscape consists of moderate to large size Eucalyptus trees with no other understory planting. Previously, RDCS LLC was hired as a certified arborist sub-consultant by Estrada Land Planning to develop a tree inventory for a sensitive portion of the project.
The inventory included tree health and when needed, tree risk assessment to determine if certain tree defects created hazardous safety conditions warranting removal.
The trees inventoried were primarily Eucalyptus cladocalyx, commonly known as the sugar gum. Smaller caliper trees ranged in age from 20 to 30 years old, while larger trees possibly up to 100 years old. The existing Eucalyptus median trees have grown and acclimated to the site conditions, under non-irrigated conditions. Preparing the trees to survive through the construction process is extremely important. The three parts of the tree requiring protection include the tree crown, tree trunk and tree roots.
Jeremy Rappoport, President of RDCS stated,
“We knew we would encounter tree roots throughout the median, our goal was to minimize root conflicts and environmental stresses to the trees.” Therefore, tree protection best management practices included aerial canopy pruning to remove deadwood from each tree crown, installing construction fencing to protect tree trunks and hand trenching and root pruning to minimize roots conflicting with street improvements.
The concept of root pruning is to trench and locate conflicting roots and hand cut them rather than having a piece of grading equipment ripe or tear the root out of the ground. Hand trenching and root pruning reduces the shock and destruction of small absorbing root hairs caused when heavy equipment rips, tears or cuts roots. Properly implemented, root pruning is an effective arboricultural technique to reduce construction impacts to tree root systems.
Best management practices also include reducing soil compaction by minimizing construction traffic and not allowing staging or parking equipment underneath tree canopies. Although the site is not irrigated, recommendations for weekly construction watering were implemented to help the trees cope with the stresses caused by the construction work.
RDCS will provide consulting services whenever construction work endangers the existing trees. Rappoport stated “We were told to be on call for monitoring services during certain phases of the street improvements and trenching. We have completed the first phase of canopy pruning and expect to provide root pruning on certain trees in the near future”.
Rappoport Development Consulting Services LLC provides certified arborist consulting services for infrastructure projects. Certified arborist-consulting services include tree inventories, tree monitoring, tree construction protection plans and best management practices, tree risk assessment, tree health assessment, tree and landscape appraisal services. Mr. Rappoport is an International Society of Arboriculture certified arborist and certified tree risk assessor, a C-27 California Landscape Contractor and a professional horticulturist. For decades, Mr. Rappoport worked for public and private master sub-division builders as a landscape and grading superintendent, manager and director of land development. More information is available at http://landscapeexpertwitness.com/.
This Post is Part Two of a Series, Click Here to Read Part One
In part one of the series Landscape Contractors Standard of Care, I discussed why a professional landscape contractor is held to a higher standard of care than an ordinary laymen. Wikipedia defines standard of care as “In certain industries and professions, the standard of care is determined by the standard that would be exercised by the reasonably prudent manufacturer of a product, or the reasonably prudent professional in that line of work.”
The previous article focused on primary contract documents required for professional landscape contractors and their clients. Contract documents focus on a design, plans, specifications, notes and details that provide the contractor information on how to price, bid, and construct a project. But what happens where there are no landscape plans or specifications for a project, no information is provided to the contractor to provide an accurate bid, quote or estimate and if awarded the contract, no information on how to construct the project? Continue reading “The Pros and Cons When Using a Landscape Design-Build Contractor” »
For years, certified arborists and urban foresters have learned the many benefits of trees. Energy savings are one of the foremost known benefits of trees as they shade building during the summer reducing the need for air conditioning and deciduous tress allow sunlight to reach structures during winter months, solar radiation decreasing the need for winter heating.
Another known benefit for trees are their ability to reduce storm water runoff and erosion, particularly during the winter months. Tree root systems bind soil particles and slow storm runoff from roofs and other impervious surfaces, trees act as bio filters, slowing storm and irrigation water runoff and allowing the water time to slowly percolate into the soil profile rather than run off into the street or storm drain system. By forcing water to pass through the soil profile, rather than runoff into storm drain systems, the soil mass filters impurities before the water enters into streams, ponds and aquifers.
I recently read a great article by Delle Willett of the North Park News entitled Landscape Architects: Artists with the Earth as a Canvas. The article focused on three local women landscape architects who have made significant contributions to enhancing the aesthetics and functionality to the City of San Diego.
While reading about the history of female landscape architects, I couldn’t help be reflect on my own background and education within the fielof landscape architecture and landscape contracting. As a college student, my path began at UC Santa Barbara and completed with a Bachelor of Science degree from California Polytechnic University, Pomona.
I wrote and article correlating my own academic history with the three landscape architects discussed in the newspaper article. For men or women interested in the field of landscape architecture, design, planning, horticulture, arboriculture and landscape contracting, or anyone who struggled to find their own passion and career path in college, I think you’ll enjoy the read.