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| I | |
| Incipient roots | Roots that develop from stems. |
| Incurved | Petals that curl inwards. |
| Inflorescence | The part of the plant that bears the flower or flowers ie: one head with lots of flowers. |
| Inorganic | Anything that is not organic but generally used to describe pesticides and fertilizers. |
| Internode | The place between two leaf nodes. |
| Insecticides | Usually chemicals that are used to kill insects and pests. |
| Insectivorous plants | Plants that derive their nutrition from trapping and digesting insects. |
| Irishman's cutting | A cutting taken with a little root attached. |