Blue gum/Thilam

By Tamilnadu Treepedia on 11 Aug 2018




General Information :

  • Bark smooth, bluish grey, deciduous in nature except base of the tree.
  • Leaves are strongly aromatic in nature.

Distribution :

  • Exotic species but naturalized in India

Habitat : The blue gum grows upon the hilly slopes and coastal plains.Soil : Adoptable under wide range of soil , Clones are available for problem soils.Altitude :Up to 1100 m (MSL)Rainfall :500-1500 mmTemperature : 12-18 °CTerrain : Plains/hilly.Tree Characteristics :
  • It is a fast growing, strong light demander, tolerate in water-logging, sensitive to weeds, frost and fire tender.
  • It has good coppicing ability 
Habit : Evergreen tree
Natural Regeneration :

  • Natural regeneration through coppice

Artificial Regeneration :

  • Seedlings can be easily propagated by vegetative cutting and nursery raised seedling.

Seed collection and Storage :

  • Fertile seeds are produced at early stage.
  • The ripe seeds are collected may –August.
  • The seeds weigh about 230-350 per gram.
  • The germination percentage is 30-80
  • One gram of seeds expected to give 45 seedlings.

Seed Treatment :

  • No pretreatment is necessary.

Nursery Technique :

  • Seed are sown in Feb-March in the mother bed
  • 75-100 gms per/m2 bed.
  • After sowing, the bed is covered with thin layer of soil and thatches
  • Bed should be watered regularly.
  • Germination takes place in 10-15 days.
  • Tow leaf stage seedlings are pricked out from the mother bed and transferred to poly bag.

Plantation technique :

  • Planting is done at the onset of monsoon.
  • The land is prepared by loosening the soil through ploughing
  • Pit size 30 cm3 and Spacing 3 x 2 m, 3x 3 m and 3.5 m x 3.5 m.

Care & Disease Control :

  • In case of coppice origin, coppicing should be at a height of 10-20 cm above the ground.
  • Singling of coppice shoots is taken up within 6 months of harvesting.
  • Undesirable shoots are cut back during the 1st and 2nd year after sprouting.

Irrigation :

  • Drip Irrigation is recommended.

Recommended Harvest :

  • Short rotations of 5 - 6 years for pulp and paper.
  •  10-15 years for plywood.
  • Over matured trees can be used for biomass power plant.

Yield :

  •  40-50 tons/ ha *
*Subject to varry according to site factors.

Agro Forestory :

  • Crops like Potato and beans are suitable for intercropping

Major uses :

Essential oil:

  • The leaves are 1 of the sources of eucalypt oil, and the principal leaf oil is cineole (45%).
  • The oil yield percentage by fresh weight is 0.9-1.4%.
  • The wood contains 0.5% essential oil. 
  • E. globulus ssp. globulus provides good firewood with an oven-dry calorific value of about 19 900 kJ/kg.                                                   
Essential oil:
  • The leaves are valuable for the extraction of eucalyptol, commercially important eucalyptus oil. 

Market details :

  • Approximately Rs.5000 to Rs.7000/ton*
*Subject to change according to market demands