Plant Pots & Planters

A plant pot needs room for roots and a way to manage water.

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A plant pot needs room for roots and a way to manage water. An outer cachepot instead holds a separate nursery pot, while a reservoir planter adds another watering arrangement. Choose the function first, then compare internal space, drainage and the weight of the filled container where it will stand.

Distinguish a growing pot from a decorative outer pot

A plant can grow directly in a suitable container with drainage, or sit in a separate nursery pot inside an outer planter. The second arrangement makes it easier to lift out the plant for watering, but trapped water still needs attention. Allow room to remove the inner pot rather than wedging it tightly into the outer one.

Understand a reservoir before choosing self-watering

A self-watering planter provides a water-storage arrangement; it does not set one watering schedule for every plant. Look at how the reservoir is filled, how excess water escapes and whether the parts can be cleaned. Choose the system around the plant’s moisture needs and inspect it regularly, especially as the plant grows or conditions change.

Plan the finished weight and position

A light empty pot becomes heavier when filled with potting mix and water. Set larger containers in their intended place before planting and think about future access for repotting. For a matched pair or multipack, compare each pot’s dimensions rather than assuming the pack gives equal sizes or that the stated width is the internal planting space.

Further reading: RHS: growing plants in containers

Useful answers

Plant pot and planter questions

Understand what holds the roots and how excess water leaves the container.

Can I plant directly into a decorative pot without drainage holes?

Use it as an outer pot unless it is designed for direct planting with an appropriate drainage arrangement. A separate nursery pot lets excess water drain before it goes back inside. Leave enough clearance to remove it and empty trapped water; a decorative outer pot should not become a permanently filled saucer.

Will a self-watering pot look after my plant while I am away?

It may reduce how often you need to refill, but there is no fixed unattended period for every plant and pot. Reservoir size, plant growth and weather change water use. Learn the filling and overflow arrangement and observe how quickly the level falls in your own setup before relying on it during an absence.

Should I add gravel to the bottom of a planter to improve drainage?

A gravel layer does not replace drainage holes and takes up space the roots could use. For a conventional planting pot, use a suitable potting mix and a clear way for excess water to leave. A purpose-designed reservoir planter is a different system: assemble its insert and overflow as instructed.

What dimensions should I compare when choosing a pot for an existing plant?

Check the usable inside width and depth against the root ball and the plant’s growing needs. The outside diameter, decorative rim and overall height can overstate the room inside. For an outer pot, allow clearance to remove the nursery pot; for a set, confirm each supplied pot’s dimensions rather than assuming they are identical.