In the “Protecting and restoring our natural heritage - a practical guide

Plant
grade
Description Advantages Disadvantages Average cost
O/G
(Open Ground)

 

 

Grown in prepared beds. Bare-rooted plants lifted before delivery. Available generally for NZ flaxes, grasses, hebes, podocarps and pittosporums Larger and well-established plants. Low cost. Need extra care. Care needed with transport and storage. Soil may compact around roots. Optimal soil moisture and weed control needed. $0.90 - $2.00
RT
(Root Trainers): RTH (Hilson)
-172 ml RTT (Tinus)- 352 ml  
Plastic containers in sets of four hinged along the bottom. Vertical grooves to discourage spiral roots. Containers can be reused Fast growth from seed tray to planting. Good root structure, little trimming. Low cost per plant. Roots can be inspected without disturbance. Easy to transport. Need extra care Root damage possible when plant taken out of container. Small to medium plants need good weed control to overcome competition. Plants can be ""leggy"" with little lower foliage. Plants can't be placed individually on site. $0.95 - $2.50
PB (Planter Bags): PB 2 PB 3 PB 5 Black plastic bags. Higher number = more soil, more roots and a bigger plant. Produces cylindrical root ball.  Bushier plants. Good height and root system. Easy to plant. May survive better in difficult sites. Roots tend to spiral and become tangled. Overgrown roots need trimming. Bulkier to transport to the planting site. Higher cost per plant. $3.00 - $7.50 depending on size and species
Pots
RX 90 (90mm) O/P - Olive Pots
(90 mm) 1 lt. (100mm)
Rigid plastic pots. Good shaped root plug. Medium size plant with balanced foliage growth. Pots can be reused. Fast growth from seed tray to planting. Medium size plants. Good balance between roots and vegetative growth. Easy to plant especially in difficult sites. Low to medium cost per plant. Roots can be inspected without disturbance. Can place plants individually on site. Overgrown matted roots need trimming. Medium size plants need good weed control to overcome competition. $1.50 - $2.50

Note: The availability of open-ground or container stock varies according to species growth rates and the preference of the grower for producing different grades. Always choose stock that looks healthy, has foliage that is not soft and lush, and is not root bound.

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