* Flexibility: You could use words like pliability, elasticity, or suppleness.
* Strength: Words like durability, resilience, or tenacity would be appropriate.
* Growth: Growth, renewal, or vitality could be used.
* Material: You could use material, substance, or wood (though bamboo is technically a grass).
Ultimately, the best choice depends on the context and the specific aspect of bamboo you want to express.