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Gardeners' glossary A-Z

Oo

Use our easy-to-understand guide to help out with all those confusing gardening terms. From Acicular to Zebrinus, Annual to Zinc, you'll find a simple explanation below.

Opposite (leaved)

Used to describe a plant having a pair of leaves at a node on opposite sides of the stem.

Orbicular

Circular in shape, referring to leaves or sometimes flowers.

Organic gardening

The cultivation of plants without the use of chemicals of inorganic origin.

Ovate

A leaf that's shaped like an egg, broadly oval usually with a tapering point.

Ovate-acuminate

An egg-shaped leaf that culminates in a long point.

Ovate-cordate

An egg-shaped leaf with a heart-shaped base.

Ovoid

An egg-shaped leaf, usually without a tapering point.

Ovule

The organ containing the egg within the ovary of a flower. After fertilisation, it develops into a seed.

Oxygenator

An aquatic plant, which, when submerged, releases oxygen into the water.

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