Quick Answer
Spring and summer are the more active feeding period for arborvitae. TPS Arborvitae Fertilizer is applied every 1–2 weeks in spring and summer, then the label reduces the schedule to every 4 weeks in fall and winter. In colder climates, avoid treating late-season feeding as a way to force fresh growth before winter. Follow the product schedule and the plant's actual growth rather than adding extra fertilizer late in the season.
Spring Is the Main Active-Growth Feeding Period
Spring is when established arborvitae return to active growth. New shoots and roots require nutrients, assuming the plant also has enough moisture, light, and healthy soil conditions.
The verified TPS label calls for feeding every 1–2 weeks during spring and summer.
That does not mean more frequent or stronger fertilizer will make a hedge grow at a particular rate. Variety, age, site, root development, and water supply still set much of the pace.
Summer Feeding
The same every 1–2 weeks label cadence continues through summer.
Summer is also when growers need to keep irrigation separate from fertilization in their thinking. Fertilizer mixed into water supplies nutrients, but the plant may need additional plain water based on soil and weather conditions.
If an arborvitae is browning during hot or dry weather, check soil moisture before deciding it needs more fertilizer.
What Changes in Fall?
The label reduces feeding frequency in fall to every 4 weeks. That is a clear shift from the active spring and summer schedule.
In colder regions, late-season fertilizing should not become an attempt to force new growth as winter approaches. The label already accounts for the seasonal slowdown by reducing frequency.
A commonly used calendar cutoff can be useful as a rough reminder in cold climates, but the supplied verified product facts do not establish a separate hard calendar date. For that reason, the more defensible rule here is to reduce to the fall label cadence rather than continuing the spring schedule late into the season.
What About Winter?
The TPS label continues the reduced schedule of every 4 weeks in winter.
At the same time, winter browning should not automatically be treated as a fertilizer problem. Evergreen foliage can be stressed by cold-season moisture loss and exposure, and fertilizer cannot turn damaged tissue green again.
If browning is your reason for considering a winter feeding, see why arborvitae turn brown before changing the fertilizer rate.
Arborvitae Feeding Calendar
| Season | Verified TPS cadence | What to focus on |
|---|---|---|
| Spring | Every 1–2 weeks | Active growth, even root-zone application, adequate moisture. |
| Summer | Every 1–2 weeks | Continue feeding while keeping irrigation adequate. |
| Fall | Every 4 weeks | Reduce frequency rather than trying to push late growth. |
| Winter | Every 4 weeks | Watch moisture and seasonal stress; do not use fertilizer to correct winter burn. |
How to Apply Arborvitae Fertilizer
Check soil moisture. Apply fertilizer to moist soil rather than an extremely dry root zone.
Mix 2 tablespoons per gallon of water. Do not make the solution stronger because the plant looks slow-growing.
Apply across the root zone. Spread the mixed solution through the soil around the plant rather than concentrating it at the trunk.
Use the correct seasonal frequency. Follow the spring/summer or fall/winter cadence from the label.
Diagnose problems separately. Browning, transplant stress, and drought are not corrected simply by adding fertilizer.
For the complete method, see how to fertilize arborvitae.
Should Newly Planted Arborvitae Follow the Same Calendar?
With newly planted arborvitae, establishment comes first. A new shrub may struggle because the root ball is drying out, because the surrounding soil drains differently, or because planting conditions are limiting root development.
Fertilizer does not replace good establishment care. Check moisture through the root ball and surrounding soil before assuming weak growth means the plant is hungry.
Once the plant is established and growing normally, a regular nutrient program makes more sense.
Why Not Just Fertilize More in Fall?
Because the plant's seasonal growth pattern is changing. The label reflects that by reducing frequency from the active-season schedule to the fall/winter schedule.
Applying more fertilizer does not create a longer growing season. In a cold climate, the goal is not to push unnecessary new growth as seasonal conditions are moving the other direction.
This is one reason a product-specific schedule is more useful than a general instruction to feed whenever growth looks slow.
Does Variety Change the Timing?
Green Giant and Emerald Green have different growth habits, but both can follow the same product directions for TPS Arborvitae Fertilizer.
Do not increase feeding because Emerald Green appears slower than Green Giant. Different growth rates can reflect the natural habit of the variety rather than a nutrient shortage.
For more on choosing the fertilizer itself, see best fertilizer for Green Giant and Emerald Green arborvitae.
What If the Arborvitae Is Brown in Spring?
Spring is when winter damage can become obvious. Brown tips or exposed sections do not necessarily mean the plant needs an immediate heavy feeding.
Determine which tissue is alive and check root-zone moisture. Fertilizer can support normal living growth, but dead foliage does not recover because nutrients were applied.
Seasonal Feeding Is About Frequency, Not Force
The biggest difference between spring and fall is not that arborvitae suddenly need a completely different fertilizer. It is that the frequency decreases as the season changes.
That makes the schedule straightforward: a more regular cadence during active spring and summer growth, then a reduced cadence through fall and winter.
