Why You Need Different EC Levels in Winter vs. Summer

Written by: Soufian b. Harvey

Adjusting EC or PPM for Hot and Cold Temps

Using the same EC or PPM all year? Not always the best move. Plants adjust how much water and nutrients they take in depending on the temperature, so changing your nutrient levels with the seasons can help them grow better.

Winter: Higher EC for Slower Growth

In the winter, plants slow down since it's cooler, and they drink less water. This means you can bump up your EC or PPM since they won’t be taking in as much liquid. The higher concentration ensures they still get enough nutrients without being overloaded with water. Even though they’re growing slower, they stay fed.

Summer: Lower EC for Fast Growth

When it’s hot, plants drink a ton of water to stay hydrated. If your EC or PPM is too high, they’ll take in too many nutrients with that water, which could lead to nutrient burn. Keeping those levels lower lets them drink what they need without going overboard on nutrients.

Evaporation in Hot Weather

In the summer, water evaporates faster, which makes your EC or PPM levels rise on their own. If you start off with a high EC, it’ll only get more concentrated as water evaporates, leaving behind extra salts. Lowering the EC at the start helps you avoid this.

Osmosis: Salt and Water Absorption

Osmosis is when water moves out of the roots if the solution around them has too many salts. This happens more in hot weather when your EC is high, and it can dehydrate your plants or cause nutrient lockout. Not good.

Why Higher EC Works in Winter

In winter, everything slows down—including how fast the plant absorbs water. That’s why you can get away with a higher EC or PPM. The plant isn’t drinking as fast, so there’s less risk of nutrient burn.

Why Lower EC is Better in Summer

When it’s hot, plants are taking in water quickly. If your EC is too high, it can stop them from absorbing water properly. Keeping the EC lower lets them get the water they need without fighting off high salt levels.

Seasonal EC Adjustments

Bottom line: adjusting your EC or PPM to fit the season is a smart move. Go higher in winter when plants are slow, and lower in summer when they’re drinking more. It helps keep everything balanced and your plants happy.

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