A container dries out faster than the same plant in the ground
A container dries out faster than the same plant in the ground, and it is the one place where a day's inattention can cost you the plant.
Well established A person has checked it against its sources. If you skip this, it still grows, just less well. The planner suggests it.
How it works
A container holds a small fixed volume of soil, its whole root zone sits above ground, cut off from the soil below, and a porous pot loses water from its sides as well as its surface. The reservoir is smaller and it empties faster.
What to do about it
Check a container at least once a day, and twice when it is hot, dry or windy. In high summer it may need water more than once a day. A plastic pot holds moisture longer than an unglazed clay one, and a bigger pot longer than a small one.
How much it matters: Not quantified as a ratio by any source read. The sources give a checking cadence and an upper bound on watering frequency in hot weather. They give no drying rate or comparison figure against open ground. That would depend on pot size, material, exposure and weather, none of which this rule models. Deliberately left unquantified.
The evidence
Evidence: checked against 2 sources in the research-based literature.
The 2 sources
Because the volume of soil is relatively small, containers can dry out very quickly, especially on a concrete patio in full sun.
Depending upon the size and material of the container, you may need to water more than once per day during hot, dry weather.
Plus one working note on how the sources were read. Every note is in the data download.
Where this rule stops
This says a container needs CHECKING more often. It does not say how much water to give it. That is still a weather question and it is still refused. Nothing here is a watering schedule. The cadence is for looking at the soil, which is the same check the planner recommends in place of a watering schedule, done more often because the reservoir is smaller.
Read next
- Choosing a field, an in-ground bed, a raised bed or a containerThe four ways to hold a garden, what each one costs and buys, and how to pick the one that fits your yard, your soil, and how much work you want.
- Container vegetable gardening for beginnersYou can grow real food in pots on a patio, balcony, or step. Here's how to pick the pot, what to fill it with, what to grow, and the one habit that decides whether it lives.
- How to water a vegetable gardenHow often, how much, and how to water. Why no one can hand you a watering schedule, the finger test that replaces it, the inch a week your rain counts toward, and the habits (deep, at the base, early, under mulch) that prevent most trouble.
How this rule has changed
Every change is dated, newest first. The full record, with each reason, is in the data download.
- Wording made clearer
- Added to the rules
More ways Milpa can help
When do I plant? · What grows well together? · Plan my garden · What can I plant now? · Something wrong in the garden? · Keep a garden diary · Heard a tip?
Cite this page
Milpa Gardens. “A container dries out faster than the same plant in the ground, and it is the one place where a day's inattention can cost you the plant.” Evidence grade: Well established. https://milpa.garden/rules/container-dries-out-faster-than-same-plant/
A garden planner built on graded evidence. Every claim states its evidence grade and links its sources on the page. Cite it with the grade, and add the date you read it.
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How we grade evidence
- Well established
- The rule names its mechanism and is settled, by sources a person has read and checked or by plain arithmetic and geometry.
- Promising
- The mechanism is named and the literature backs it. A few questions are still open.
- A good hunch
- Plausible by its mechanism, but field studies are thin, so treat it as a lean.
- Contested
- The evidence points both ways, or no study has tested it, so the planner does not enforce it.
- Refuted
- The claim did not survive its sources. It is kept so the folklore can be answered.