Fertilize your houseplants in the spring
You can start fertilizing your houseplants about 8 weeks before the last spring frost.
As in the vegetable garden, the ice saints are an ancestral landmark that has proven its worth.
This means starting to apply fertilizer in mid-March.
Fertilize indoor plants in summer
When summer arrives, it's time to switch to a more regular schedule of houseplant fertilization.
Fertilize indoor plants in the fall
About 8 weeks before the first expected fall frost, reduce the amounts and frequency of your fertilizers.
This means that from mid-August you can halve the amount of fertilizer and extend the interval between two fertilizations.
Fertilize indoor plants in winter
Most houseplants are not in a state of active growth during the winter and therefore should not be fertilized.
There are a few exceptions to this rule.
Some plants, such as orchids for example, can stay in bloom all winter long if they have enough nutrients and light.
In this case, an application of a half dose of liquid fertilizer in the middle of winter can be envisaged.
Outside temperate climate
This calendar works assuming you live in a temperate climate.
In a climate that doesn't experience regular winter frosts, continue to fertilize your houseplants throughout the winter, but do so at half the amount and frequency of your summer applications.
And if you live in a tropical climate, where it's always hot, keep fertilizing your houseplants in the summer all year round.