Ian Brown - Mt William Advanced Tree Nursery
Please visit http://www.advancedtrees.com.au/
We are proud to be recommended by Mt William Advanced Tree Nursery who have used RocketPot
Tree Growing System for more than 25 years.
See RocketPot in action at http://www.advancedtrees.com.au/tree-pictures-advanced.html
The Professional Landscaper using the RocketPot Tree Growing System (RPTGS)
can expect to "get it right first time every time". RocketPot
Containers are the heart of a system. They root prune in three dimensions.
There is a 20-mm air space beneath each container. Advanced trees grown in
RocketPot containers have a multitude of downward pointing and
non-circling root tips. Just like the walls. Three dimensional air root
pruning is a reality now.
You can buy an advanced tree with confidence as part of the RPTGS. They
have vastly improved shelf life in the grower's nursery without
destructive root circling. When planted out, trees reach self -sufficiency
in months - not years.
An abundance of apically dominant white root tips ensures consistent,
reliable tree growth. Control of air and moisture is achieved by way of 5%
open area in the walls and 10% open area in the cuspate plastic base
beneath the container. The tree can "breathe" even with low
porosity growing media.
Deep cusps guide root tips to desiccate in air. Several new roots emerge
well back along the root and grow out to become leaders if the RocketPot
is removed or to be desiccated if it is not removed. This process repeats
again and again until the pore space is all used. The tree reaches an
equilibrium state. Little growth occurs until the RocketPot is removed and
the tree is planted. Given a well-drained and aerated planting site, the
tree explodes into life again. It grows like a Rocket. The RPTGS advanced
tree must be watered and maintained just like any other tree. But
self-sufficiency can be achieved after one or two seasons instead of four
or more seasons. The cost savings swamp any additional cost of buying a
RocketPot tree. Typically, street trees cost $40 per year to water. RPTGS
embraces 20 principles. The first 10 principles cover the nursery phase
and the last ten covers planting and after care - see www.trentcom.com.au
In the nursery, RPTGS advocates direct seeding and early potting on into
lower porosity media. The RPTGS nursery cuts pot-up steps to a minimum. It
uses cylindrical containers to make space for root development where it
wants to grow; outward and downward as in nature. Air space below every
container cuts the risk of infection from water borne pathogens. Transfer
from the nursery to the planting site is in ultra light tree vending bags.
They cost about 12% of the RocketPot container cost. The vending bags
weigh less than 10% of a matching hard wall container and reduce nursery
waste. The bags are clear to show off the excellent root system. RPTGS
recommends draining each and every plating hole for the tree's first year
in its new location. Some ideas for drainage include intersection of
recent trenches or curbside drains. Planting holes with depth equal to
root ball depth and three times root ball diameter lead to good aeration
and help drainage. RPTGS advocates backfilling with friable soil from the
hole with little amendment (except in sandy soils) and flooding in,
mulching and watering twice weekly till self - sufficient. Staking is
often unnecessary because the squat wide root ball with hard edges resists
wind throw. The advanced tree industry is sadly in need of research. The
Australian Eucalypt is a challenge to any advanced tree grower. They get
out of hand so easily without precise control of the root system from
germination to transplanting, and careful management of water and
nutrients. Growing and transplanting Australian Native Trees at an
advanced age can be a breeze when you follow the RPTGS principles.
TreeNet will measure the outcomes of various tree-growing systems.
Meanwhile we must rely on anecdotal evidence. The track record of RPTGS is
Consider buying enough RocketPot grown trees to experience the difference
this year. Register your site with TreeNet -help establish which tree
growing system gives the best results over the years to come.
Roger Farquhar - Farquhar
Landscapes P/L - Hunte
r Valley NSW
experience is that the RocketPot produces a plant with an increased
trunk calliper & support root growth, which holds together well
& is easier to handle for the installer. RocketPot plants require
minimal staking & show little transplant shock. To date RocketPots
give the best simulation in a nursery of the conditions experienced by
an inground field grown plant.
Container grown plants are only OK if they are planted within a very
narrow time frame i.e.
Too early & the rootball breaks apart
Too late & they are rootbound."
Garry Lawes Land Developer and Nurseryman
- Keilor, VIC
Refer to the pictures on Page 7. Garry grows many of the trees used in
comments - “I water all
of the trees after planting in the street. Trees grown in RocketPot
containers establish sooner than those grown in any other system I have
Ron Symons – Specialist tree planter -
Ron has not tried many RocketPot grown trees yet but is interested to try
"Good root growth is the most important aspect of establishing
Normally I am using a two year maintenance program. If the tree has not re‑established in two
Years, it is likely to fail. Typically, I water 30 times per tree each
year for two years. The
average water application ranges from 35 to 70 litres per tree.
Councils are looking for a long-term asset with a minimum of maintenance
after 2 years
Councils are rejecting more trees, long term quality is more important
than cheap unsuitable trees that will not establish or require long term
Paul Deering - Whitsunday Tropical Trees
“The new RocketPot containers are working well
for my nursery. We want to produce a better product . RocketPot adds value to our trees.
Muraya and Syzigium work well in RocketPot ‑ we get more compact
growth. The elevated base gives better tree health”.
David van Houten ‑
Rowood Trees, Harrington Park NSW. “I have ceased staking trees grown in [squat] air root pruning
containers. Staking is only necessary occasionally when the tree is very
tall with a bushy head. Trees in air pruning containers outgrow those in
bags and hard wall containers - particularly hard wall stock
planted in a small hole. Skilful watering saves time and trees"
in root structure and caliper development
John Skehann – Coomera
River Nursery Queensland
“I have noticed a
significant improvement in the root system and caliper development of
certain trees when grown in 40 litre RocketPot containers and compared
with 40 litre bag grown trees. Particularly Flindersia
australis, Backhousia citriodora and Auracaria cunninghamiana”
in shelf life
Cox - Mirvac
Lend Lease Village Consortium '2500 trees were delivered to
us in RocketPot containers. They were planted in the ground in the
RocketPot containers within specially aerated cavities to give a temporary
tree presence during the games. (System design by David Lawry). After 9
months in the ground we removed them and 2000 are in good condition and
re-useable. The balance of 500 were not useable only because roots escaped
to the soil via debris in the hole. The trees we salvaged will be used on