Table 4.

Costz per live 2.5 in. (6 cm) caliper live oak tree from six nursery production methods and under two landscape irrigation regimes.

Production methodCost per live tree
Summer irrigationyNo summer irrigationx
Plastic container$445$588
Plastic container with SpinOut$445$784
Air root-pruning (ARP) container$445$672
Low-profile ARP container$445$1,176
Root-pruned, field-grown B&B$383$274
Non-root-pruned, field-grown B&B$383$383
  • z Cost (U.S. dollars) of purchasing, installing, and irrigating 14 trees divided by number of live trees (see Table 2) 1 year after transplanting.

  • y Trees irrigated four times in 9 days then twice weekly for 6 months (summer irrigation) or 5 weeks (no summer irrigation). Five gal (18 L) water was applied to the top of the root ball at each irrigation.