Short answer: most houseplants need little or no fertilizer in winter. Days are shorter, light is weaker and growth slows right down, so plants use far fewer nutrients. The exceptions are plants in a bright spot or under a grow light that are still pushing out new leaves. Here is how we decide, and what we do instead of heavy feeding.
Why most plants slow down in winter
Plants use light to turn nutrients into growth. When light drops, growth slows, and a plant that is not growing has little use for extra food. Fertilizer it cannot use tends to sit in the potting mix, and over time that can build up as salts around the roots.
That is why we treat winter as a maintenance season, not a growth push. Think of it as keeping the soil in good shape so your plants are ready when spring light returns.
Is your plant resting or still growing?
Look at the plant, not the calendar. Here is what we check:
- New leaves or shoots. If you see fresh growth, the plant is still active.
- Light. A south or west window, or a grow light, gives a plant more to work with than a dim corner.
- Water use. If the pot dries out slowly, the plant is using less water and is probably resting.
- Plant type. Slow growers like snake plants and ZZ plants rest most of the winter. Winter bloomers keep going.
No new growth and low light? Skip nitrogen feeding until spring. Still growing in bright light? A light touch is fine, and for Easy Feed 12-6-12 we always say follow the directions on the pack.
What to do instead of feeding
Winter problems often come from water and light, not food. A few habits that help more than extra fertilizer:
- Water less. Let the top of the mix dry a little more than you would in summer. Soggy soil in winter is a common cause of trouble.
- Move plants toward light. Shift them closer to a bright window, but keep leaves away from cold glass and drafts.
- Wipe the leaves. Dust blocks light, and a quick wipe with a damp cloth helps.
- Check for yellowing. If leaves are turning yellow, read our guide on why houseplant leaves turn yellow before reaching for the fertilizer.
Our winter soil maintenance routine
If you want to do something for your plants over winter, we focus on the soil, not on pushing leaf growth. Soil Recharge and Microbe Boost are a good pair for this, because the goal is to support soil health and microbial activity without pushing growth a plant cannot support in low light. Here is the mix, exactly as it appears in our Winter Soil Maintenance Formula:
- 1 scoop Soil Recharge
- 1/2 scoop Microbe Boost
- 1 gallon of water
Add the scoops to 1 gallon of water, stir until dissolved and water your plant thoroughly. How much to use per pot:
- Small pot (4 to 6 in): 1/4 of the recipe (about 1 cup)
- Medium pot (8 to 10 in): 1/2 of the recipe (about 2 cups)
- Large pot (12 in and up): the full recipe (1 gallon)
Frequency: once every 6 to 8 weeks through winter. That is it. This is a gentle routine for resting plants, so there is no need to do it more often.
Signs you are overfeeding in winter
If you have been feeding on a summer schedule, check for these:
- A white crust on the soil surface or the pot rim
- Brown, crispy leaf tips
- Leaves wilting even though the soil is moist
- Growth that looks weak and stretched toward the window
If you see these, stop feeding and water the pot thoroughly so water drains out of the bottom. Then let the plant rest until growth picks up again.
When to start fertilizing again
Start again when you see new growth in spring and the days are getting longer. At that point plants are ready to use nutrients again, and you can move back to your regular routine. We cover that in our Spring Awakening Formula, which is made for the first sign of new growth.
FAQ
Can I fertilize houseplants once a month in winter?
For most plants in low light, we would not. If your plant is actively growing in a bright spot, a light feed is fine. Use our winter recipe above every 6 to 8 weeks, or follow the directions on the pack for Easy Feed.
Do all houseplants stop growing in winter?
No. Many slow down or rest, but plants in bright light or under grow lights can keep growing. Watch the plant. New leaves tell you it is still active.
Should I stop watering as well as feeding?
Not stop, but water less. Check the soil first and water when the top of the mix has dried out. Plants in winter use less water than in summer.