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About Tenco
Tenco is one of New Zealand’s largest exporters of forest products. We have built to this position since 1991 when the company was set up to export lumber to growing Asian export markets.  Experience and reputation count; from small beginnings Tenco has become the largest independent exporter of New Zealand lumber and New Zealand’s 4th largest log exporter.  Tenco has a regular shipping program of their own log vessels and in combination with these and other ships currently calls  at 7 New Zealand ports (5 North Island and 2 South Island).
 
Tenco buys standing forests.  Tenco currently has a number of forests which they purchased at harvestable age to log over a number of years for export and domestic markets.  Tenco also regularly buys smaller tracts of forest to harvest immediately or immature forests to hold until harvest time.  Tenco is interested in broadening  the  base of owners from whom it purchases forests and stands of trees.  A deal with Tenco is a certain transaction.  The owner and Tenco will agree on a value of the tree crop and then Tenco will pay this amount to the owner either in a lump sum amount or on rate per volume unit out-turn from the forest depending on the nature of the tree crop.
 
Tenco knows there are a lot of farmers who have trees that are close or ready to harvest and will be asking themselves how they should proceed with the sale of their trees.  For some farmers the kind of certain transaction with money in the bank could well be appealing. Tenco is actively interested in buying harvestable forests or trees from areas including all the North Island (except the Gisborne and East Coast districts) and Nelson & Marlborough in the South Island .
 
If you own a forest in this area (16 years and older) and are ready to enter into this kind of agreement Tenco is interested to develop something with you.
Please contact: Josh.Bannan@tenco.co.nz 
Work: +64 7 357 5356  Mobile:  +64 21 921 595  www.tenco.co.nz
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NZFFA Member Blogs

Any member of NZFFA can set up their own blog here, just ask Head Office to set one up for you and join the ranks of our more outspoken members...

You can either publish your blogs yourself, or email a document to head office for publishing.


Member Blogs


Recent blogs:

Eucalyptus sphaerocarpa, my favourite durable timber species

Dean Satchell's blog
Saturday, December 20, 2014


Eucalyptus sphaerocarpa is a class 1 durable eucalypt species that I introduced into New Zealand in the mid-1990's. I was looking for a highly durable species from the monocalyptus group of eucalypts, which have shown to have good levels of resistence to insects in New Zealand.

E. sphaerocarpa is a large tree from the Blackdown tablelands in Southern Queensland and grows at about 1000 m altitude. It's called Blackdown stringybark, although actually an ash eucalypt rather than a true stringybark. The timber is highly prized in this area. Mike Wilcox, renowned botanist and eucalypt enthusiast, saw the species in its native habitat and described them to me as "huge magnificent trees, a sight to behold".

So why do I like it so much? It is disease and pest resistent, grows extremely straight and has a very high content of durable heartwood. What more could I ask for... the "silver bullet" from over 20 years of durable eucalypt species trialwork.

 

Questions:

Is there a market for ground durable untreated posts and poles in New Zealand?

Is it viable to be production thinning 10 year old trees for naturally durable posts, then growing the remaining trees to 25 years for a high quality class 1 durable hardwood decking product that will last 40+ years in service?

Can we grow durable eucalypts with just standard practice lift pruning and thinning... without any form pruning?

 

Answer:

I beleive yes to all questions above. However, we need the right species. In my view the only species that might fit the bill are E. cladocalyx and E. sphaerocarpa. Sugar gum (E. cladocalyx) is a woodland species and has a very open crown. Great for dryland climates where we wouldn't expect much in terms of sawlog volume per hectare. Species with good crown density like E. microcorys (tallowwood) and E. sphaerocarpa can be held at a high final crop stocking and still produce good diameters, thus a high volume per hectare at harvest. Siting tallowwood isn't so easy... wonderful class 1 durable timber but the species has an unstable crown that smashes in high winds, and the species is very frost tender.

What about siting E. sphaerocarpa? My trees were planted on a windy ridgetop in Northland, on low fertility clay soil. They have thrived. Not sure about frost hardiness but I'm working on it and have planted trees in a range of localities throughout New Zealand. The expectation is for medium frost hardiness. Anybody interested in planting this species should get in touch with the NZFFA Eucalyptus Action Group, we are looking for volunteer sites and growers willing to trial durable stringybark eucalypts.


E. sphaerocarpa plantation in Northland. Pruned stand showing excellent form. These trees have not been thinned and were planted at a low stocking. There was no form pruning.

 


Cross section at 4m from a tree that blew down in a storm at age 10. Five years on the ground and the sapwood has rotted away. Note the high heartwood content. I'd be interested in measuring the density of this "young" material, it certainly feels very heavy.

 


16 year old tree, 45cm DBHOB, looking promising for seed collection...


At 20m this tree is forming a crown. It is pruned to 15m


Comparison between 10 year old E. sphaerocarpa (in front) and 10 year old E. muelleriana (behind), both blew over in a storm 5 years ago. E. muelleriana (yellow stringybark) grows a bit faster but is not as durable and has a bit more sapwood. Both are monocalypts and put on early heart. E. muelleriana has timber similar to E. pilularis (blackbutt), pale yellow/brown whereas E. sphaerocarpa has brown timber.


For comparison, here is 10 year old E. bosistoana (coast grey box). This is a class 1 durable species and being in the symphyomyrtus group it puts on heartwood slowly. I don't beleive there is any heartwood to speak of and if there is any it certainly isn't clearly defined. This species also has poor stem form, suffers multiple leaders and is not at the top of my list.


Here is wood from 10 year old E. quadrangulata (white-topped box), another durable symphyomyrtus species. The base of the tree was cut and appeared to have some heartwood. This was placed on the ground outdoors to test durability. The wood was perishable to the core, with no "real" heartwood present at this age. Although very fast growing, trees suffer from insect damage and multiple leaders.


Eucalyptus laevopinea for high value hardwood

Dean Satchell's blog
Sunday, May 25, 2014

Eucalyptus laevopinea (silvertop stringybark) is a eucalyptus species that grows really fast and produces a high quality hardwood timber.

It comes from the tablelands of New South Wales and is both cold-hardy and very fast growing. The timber is hard, strong and moderately durable. This makes it suitable for a range of high-value end uses like flooring, outdoor decking and furniture, structural applications requiring good strength and being a decorative stable hardwood could even be used for high-quality furniture.

The tree

E. laevopinea is really quite an amazing tree. It has great form, even better growth rates, is mostly self-pruning and has the best health of any eucalypt I've seen. A good dense crown of leaves means high volumes per hectare and resistence to bugs and possums means good growth rates.

The timber

The timber is pale brown and has a narrow band of sapwood. The sapwood is resistent to lyctus borer, which is an added bonus for internal applications, i.e. no treatment required. The heartwood is moderately durable and thus suitable for outdoor uses such as decking and outdoor furniture. Being a stringybark, the logs are easy to mill with low growth stresses and no shakes. Excellent surface hardness for use as flooring and best of all, fast growth! Good stability means that it doesn't need to be quartersawn and is easy to dry. 

Growth rates

I've seen a few stands of E. laevopinea and they were all of similar growth rates to good radiata pine and the ash eucalypts. The ash eucalypts (e.g. E. fastigata and E. regnans) are non durable and soft, therefore not really of much use except for panelling. This one is far more useful but also grows fast, and from what I've seen could be harvested in only 20 years.

Siting

E. laevopinea is growing well as far south as Otago and has shown to be suitable for most New Zealand climates, even colder sites. It grows really well in Northland so is happy with humidity, unlike many eucalypt species.

E. laevopinea is my pick for hardwood timber where extreme durability is not required. Ground durability would be expected to be limited, but I'm yet to be convinced that naturally ground durable timbers hold higher value anyway.


Tim Rose and Angus Gordon admire a 16 year old E. laevopinea in Northland. The diameter at breast height is 61 cm and the tree is pruned to 8m.


The same tree showing a dense crown of leaves. The crown structure is great for an open grown tree. John Pedersen reckons he only pruned "a few branches off" and the tree was otherwise self-pruning.


On the left E. laevopinea and on the right E. quadrangulata. Both trees are 16 years old, open grown and pruned to 8m. The crowns are a similar size but the E. laevopinea has a DBH (OB) of 61 cm while the E. quadrangulata has a DBH (OB) of 39.75 cm. The E. quadrangulata required significantly more pruning but has still grown well and produces a durable timber.



Disclaimer: Personal views expressed in this blog are those of the writers and do not necessarily represent those of the NZ Farm Forestry Association.

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