Valentine’s Day Tree Care in Greensboro, NC: Horticultural Oil vs. Systemic Drench (and When to Use Both)
If you’ve battled pests in the past, Valentine’s Day is a great reminder to show your trees some love and get ahead of the season—before buds break and before pests explode.
At Guilford Garden Center in Greensboro, NC, we get this question a lot in late winter: Should I use horticultural (dormant) oil… or a systemic tree & shrub drench? Here’s a simple way to choose the right approach—plus when it makes sense to use both.
Quick answer: oil vs. drench
- Horticultural (dormant) oil = a contact spray that helps smother overwintering pests on branches.
- Systemic tree & shrub drench = a root-absorbed treatment that helps protect plants from the inside out.
Choose horticultural/dormant oil if you’ve had scale, mites, or aphids
Horticultural oil is a contact treatment that works by smothering pests and overwintering eggs.
Use it when
- You’ve had scale, mites, aphids, or overwintering eggs on branches in the past
- You want a contact option (works where it’s sprayed)
- You’re treating fruit trees/bushes or ornamentals before buds break
Product to ask for
- Fertilome Horticultural Oil
Best timing in the Triad
Now—late winter/early spring, before buds break. Always follow the label for temperature and timing guidance.
Fruit tree spray: where it fits
If you grow fruit, you may also need a targeted spray program as the season progresses.
Product to ask for
- Bonide Fruit Tree Spray
This is often used later in the season (timing depends on the crop and what you’re preventing). We can help you match it to what you’re growing and what showed up last year.
Choose a systemic tree & shrub drench for season-long protection
A systemic drench is applied to the soil and absorbed by the roots, then moved through the plant—so it protects from the inside out.
Use it when
- You want season-long protection from pests that feed on the plant (like aphids, scale, and borers)
- You need something that works inside the plant, not just on the surface
Product to ask for
- Bonide Annual Tree & Shrub Drench
Best timing
Now, so the plant has time to take it up before infestations start.
Can you use both oil and a systemic drench?
Sometimes, yes—because they work differently: – Oil helps knock down what’s already on the plant (or what’s overwintering) – Drench helps protect new growth as the season ramps up
If you had a rough pest year last season, combining the two (at the right time) can be a smart, simple plan.
When you should NOT use one (quick safety notes)
- Don’t use a systemic drench on edibles (fruit/veg/herbs)
- Avoid drenching when plants are blooming to protect pollinators—another reason late winter is such a good time.
- Don’t apply oil if the plant is stressed, if temps are outside label guidance, or if buds are breaking (follow the label).
Not sure which fits your plant?
Bring a photo (or a sample branch) and tell us what you saw last year—scale, aphids, borers, sooty mold, sticky leaves, black coating, etc. We’ll help you pick the simplest plan.
If you’re bringing a sample, please place it in a sealed zip-top bag.
Important: Always read and follow label directions carefully.
Visit Guilford Garden Center
Need help in person? Stop by Guilford Garden Center, and we’ll get you set up with the right product and timing for your trees and shrubs.
