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TALL POT TREES TALL POT TREES A New Technique for Arid Land Revegetation Projects Diana Stuart, Environmental Program Manager Flood Control District of.

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Presentation on theme: "TALL POT TREES TALL POT TREES A New Technique for Arid Land Revegetation Projects Diana Stuart, Environmental Program Manager Flood Control District of."— Presentation transcript:

1 TALL POT TREES TALL POT TREES A New Technique for Arid Land Revegetation Projects Diana Stuart, Environmental Program Manager Flood Control District of Maricopa County

2 Where did this idea come from? European forestry departments have used tube-growing methods for several decades.European forestry departments have used tube-growing methods for several decades. Tube-grown horticultural plants have been used in the S/E United States for about 20 years.Tube-grown horticultural plants have been used in the S/E United States for about 20 years.

3 In the mid-1980s, a researcher from San Diego State University began experimenting with using long tubes to grow arid land tree species.In the mid-1980s, a researcher from San Diego State University began experimenting with using long tubes to grow arid land tree species. The idea started to catch on - - -The idea started to catch on - - -

4 - - - In the late 1980s, Joshua Tree National Park began growing tall pot plants on a large-scale for revegetation projects in California;- - - In the late 1980s, Joshua Tree National Park began growing tall pot plants on a large-scale for revegetation projects in California; In the 1990s, the Arizona Game and Fish Department, and the Center for Native and Urban Wildlife at Scottsdale Community College began growing tall pot plants in Arizona.In the 1990s, the Arizona Game and Fish Department, and the Center for Native and Urban Wildlife at Scottsdale Community College began growing tall pot plants in Arizona.

5 Part of Joshua Tree N P Nursery Set Up

6 Tall Pot Nursery – Scottsdale Community College

7 Flood Controls Tall Pot History In 2001, after seeing the success of using tall-pot grown trees at Arizona Game and Fish and Scottsdale Community College projects, Theresa Pinto started the Districts Tall Pot Nursery.In 2001, after seeing the success of using tall-pot grown trees at Arizona Game and Fish and Scottsdale Community College projects, Theresa Pinto started the Districts Tall Pot Nursery. On a shoestring the Nursery produced over 1000 trees in its first year.On a shoestring the Nursery produced over 1000 trees in its first year.

8 The early Tall Pot Nursery with pots on the ground and an overhead irrigation system.

9 The Flood Control District has experimented with several irrigation system layouts, several germination techniques, and several planting methods.The Flood Control District has experimented with several irrigation system layouts, several germination techniques, and several planting methods. The FCD Tall Pot Nursery currently has the capacity for 6000 trees, and is growing 4000 this season.The FCD Tall Pot Nursery currently has the capacity for 6000 trees, and is growing 4000 this season.

10 Why Tall Pots? Characteristics of Arid Land Trees: Most species have very long, fast-growing tap roots that reach to find soil moisture.Most species have very long, fast-growing tap roots that reach to find soil moisture. Tap root length is several times height of above-ground stems.Tap root length is several times height of above-ground stems. Foliage grows rapidly in hot weather but goes dormant when weather cools.Foliage grows rapidly in hot weather but goes dormant when weather cools.

11 Anatomy of an Arid Land Tree

12 What Happens in a Typical Container? Tap roots grow around and around in bottom of container.Tap roots grow around and around in bottom of container. Trees become root bound.Trees become root bound. When planted, root ball needs to be spread by hand.When planted, root ball needs to be spread by hand.

13 Tap root is spread, but still shallow.Tap root is spread, but still shallow. Tap root has to re-orient and grow toward soil moisture.Tap root has to re-orient and grow toward soil moisture. If not irrigated, tree can become stressed or die before reaching soil moisture.If not irrigated, tree can become stressed or die before reaching soil moisture.

14 Typical Root-bound Plants

15 What Happens in a Tall Pot? Growing in a long tube allows the tap root and the ancillary roots to follow their natural tendency to reach for soil moisture.Growing in a long tube allows the tap root and the ancillary roots to follow their natural tendency to reach for soil moisture. Even without irrigation, this slight head start is often the difference between tree survival and tree mortality.Even without irrigation, this slight head start is often the difference between tree survival and tree mortality.

16 Tap Root From A Cut-Open Pot At Scottsdale Community College

17 What is a Tall Pot? Tall Pots are long, narrow tubes with wire mesh at the bottom to hold in soil.Tall Pots are long, narrow tubes with wire mesh at the bottom to hold in soil. The District uses 10-foot lengths of #D2729 PVC, 6-inches in diameter, cut into 4 each 30-inch long tubes.The District uses 10-foot lengths of #D2729 PVC, 6-inches in diameter, cut into 4 each 30-inch long tubes. Squares of wire mesh hardware cloth are put in the bottom to hold in the soil.Squares of wire mesh hardware cloth are put in the bottom to hold in the soil.

18 Tall Pot Tubes Ready for Use in FCD Nursery

19 Yes, we have specs - - - The Flood Control District has produced a full set of specifications for tall pot tube fabrication, rack fabrication, soil mixture, and planting methods. These are available for both growers and end-users upon request.

20 Typical Tall Pot Cross-section

21 Planting Tall Pot Trees To provide root/soil moisture contact, planting hole is:To provide root/soil moisture contact, planting hole is: –narrow diameter and as deep as pot, –augured or drilled with post hole digger, –filled with water before planting.

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26 What about irrigation? With irrigation, arid land trees do best if planted in the early spring to take advantage of their peak growing period during the warm/hot months.With irrigation, arid land trees do best if planted in the early spring to take advantage of their peak growing period during the warm/hot months. Without irrigation, arid land trees do best if planted in fall or early winter - - -Without irrigation, arid land trees do best if planted in fall or early winter - - -

27 –Roots continue to grow even when above-ground growth slows; –Trees get established without the stress of summer heat; and –Winter rains provide just enough water - - - USUALLY. - - - USUALLY.

28 But theres a trick: The Flood Control District specifies planting with DriWater® at our project sites when irrigation is not feasible.The Flood Control District specifies planting with DriWater® at our project sites when irrigation is not feasible. DriWater® is water blended with a cellulose gum and gel-based matrix.DriWater® is water blended with a cellulose gum and gel-based matrix. Soil organisms consume and metabolize DriWater® and the by-product is free water.Soil organisms consume and metabolize DriWater® and the by-product is free water.

29 DriWater® gives plants a steady moisture boost as they establish, regardless of seasonal rains; DriWater® gives plants a steady moisture boost as they establish, regardless of seasonal rains; It slowly delivers water to the root zone for up to 90 days; It slowly delivers water to the root zone for up to 90 days; The containers are biodegradable so they can be left in place.The containers are biodegradable so they can be left in place.

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31 Installing DriWater®

32 Protection methods Seedlings and saplings can be protected in several ways. There are advantages to each method:Seedlings and saplings can be protected in several ways. There are advantages to each method: –Chicken wire cages –Biodegradable protectors –Liquid Fence® spray

33 Biodegradable protectors in the Nursery and at a project sight.

34 Some Tall Pot Success Stories: In the South to grow more productive Pawpaws.In the South to grow more productive Pawpaws. Over 1300 Tall Pots with 98% survivability used for a highway project near Santa Fe, NM.Over 1300 Tall Pots with 98% survivability used for a highway project near Santa Fe, NM. Revegetation project in Death Valley N.P. with 87% survivability.Revegetation project in Death Valley N.P. with 87% survivability.

35 Several hundred Tall Pot trees used to revegetate Red Rock Canyon State Park in California after the filming of Jurassic Park!Several hundred Tall Pot trees used to revegetate Red Rock Canyon State Park in California after the filming of Jurassic Park! More than 10,000 Tall Pot trees used by Cal Trans (California DOT).More than 10,000 Tall Pot trees used by Cal Trans (California DOT). The revegetation of Cienega Creek in Pima County by Pima FCD.The revegetation of Cienega Creek in Pima County by Pima FCD. And - - - ?And - - - ?

36 FCD Chandler Mitigation Site During Planting in 2004, and July, 2005

37 McMicken Dam Project Site Before Revegetation – Summer 2005

38 Summary of Why Using Tall Pots is a Good Policy: Substantial cost savings over installing irrigation systems or frequent use of water trucks;Substantial cost savings over installing irrigation systems or frequent use of water trucks; Higher survivability in harsh environments.Higher survivability in harsh environments. Works with the natural rooting tendencies of arid land species. Works with the natural rooting tendencies of arid land species.

39 Acknowledgements: Theresa Pinto, Project Manager, Planning Branch, Flood Control DistrictTheresa Pinto, Project Manager, Planning Branch, Flood Control District Ben Ganados, Ecology Technician, Planning Branch, Flood Control DistrictBen Ganados, Ecology Technician, Planning Branch, Flood Control District Jean Graham, Biologist, Native Tree Nursery, Joshua Tree National ParkJean Graham, Biologist, Native Tree Nursery, Joshua Tree National Park Roy Barnes, Director, Center for Native and Urban Wildlife, Scottsdale Community CollegeRoy Barnes, Director, Center for Native and Urban Wildlife, Scottsdale Community College Russ Haughey, Habitat Program Manager, Arizona Game and Fish DepartmentRuss Haughey, Habitat Program Manager, Arizona Game and Fish Department

40 Questions ? For Tall Pot technical questions: Diana Stuart 602.506.4766dms@mail.maricopa.gov For Planting or Nursery operations: Ben Ganados 602.506.8612bag@mail.maricopa.gov


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