---
title: Tech Sheet - Campbell Shadow Ultra Plant Growth Regulator - 210525
canonical: https://fernland.com.au/documents/1061/
dateModified: 2026-07-12 07:55:45
summary: Technical Sheet
type: tech_sheet
---

# Tech Sheet - Campbell Shadow Ultra Plant Growth Regulator - 210525

> Technical Sheet

[Image: Logo of Campbell Chemicals. A large green diamond shape representing a turf area. Text: SHADOW ULTRA PLANT GROWTH REGULATOR. PGR.]

**120g/L Trinexapac-Ethyl**
**120ME - Micro-emulsion formulation**

**Features of Shadow**
• Inhibits vertical shoot growth.
• Aids in producing healthy turfgrass colour and root mass development.
• Helps turf withstand heat seasonal summer stresses with, drought heat and lack of sunlight issues.
• Micro-emulsion formulation that is petroleum solvent free and tank mix flexible.
• Rainfast in 3 hours.
• Increases quality of final cut, particularly in high maintenance situations.
• Reduced clippings for efficient mowing and reduction in waste.
• Registered for a very broad range of turf species
• The Shadow formulation has been used extensively in Australia, USA & Canada

[Image: Logo of Colin Campbell (Chemicals) Pty Ltd. Text: 100% Australian owned & operated. Established 1940. The Key to Professional Turf.  . Image of a golf course.]

***

**Product Name:** Shadow® Ultra
**Product Type:** Plant Growth Regulator
**Active Constituent:** 120g/L Trinexapac-Ethyl
**Resistance group:** N/A
**Formulation:** micro-emulsion
**Pack Size:** 5L (4 x 5L per carton)

**TURF LABEL EXTRACT**

| Situation | Grasses | Rate | Critical Comments |
| :--- | :--- | :--- | :--- |
| | | Per ha | Per 100m² | |
| Golf course and bowling greens | Bentgrass | 1 to 2L | 10 to 20mL | Apply Shadow Ultra at least 6 hours before or after mowing and when turf is actively growing. Use the lower rates on turf with moderate growth rates where a lower level of growth regulation is required, or when used in a program. Apply rates towards the highest end of the rate range when growth is vigorous or when longer periods of 4 to 6 weeks regulation are required. Application made to turf growing under cool conditions or to turf with low nutrient levels or where growth rates are low may result in discolouration. Well maintained turf surfaces are those which receive at least weekly mowing and good levels of water and fertility are maintained. Refer to Application section for detailed information. |
| | HybridCouch | 0.15 to 0.6 L | 1.5 to 6mL | |
| Golf course fairways | Carpet Grass, Kikuyu | 1.6 to 4 L | 16 to 40 mL | |
| | Common Couch | 0.8 to 1.6 L | 8 to 16mL | |
| | Couch varieties Greenless Park, Santa Ana, Wintergreen | 0.6 to 1.2 L | 6 to 12 mL | |
| | Fescue, Perennial Ryegrass | 1.6 to 3 L | 16 to 30 mL | |
| Golf course short roughs, well maintained lawns, general turf surfaces | Bahia Grass, Bent Grass, Fescue, Perennial Ryegrass | 2 to 4L | 20 to 40mL | |
| | Buffalo Grass, Common Couch, Hybrid Couch | 1 to 2L | 10 to 20mL | |
| | Kikuyu | 1.6 to 6L | 16 to 60mL | |
| Golf courses long roughs, parks, ovals, lawns, general grassed areas | Bent Grass, Fescue, Perennial Ryegrass | 2 to 6L | 20 to 60mL | |
| | Buffalo Grass, Common Couch, Hybrid Couch | 1 to 4L | 10 to 40mL | |
| | Kikuyu | 2 to 8L | 20 to 80mL | |
| Bunker facing, path and garden edging, Footpath and curbside edging, Fence lines, around trees | Bent grass, Common Couch, Perennial Ryegrass | 4 to 6 L | 40 to 60 mL | Apply Shadow Ultra at least 6 hours before or after mowing and when turf is actively growing. On difficult to mow areas apply Shadow Ultra to actively growing turf and mow 3 to 4 days after application. Apply in a strip approximately 25 to 50 cm wide. Use the lower rates of Shadow Ultra around bunker edges and the higher rates in the other situations. Application made to turf growing under cool conditions or to turf with low nutrient levels or where growth rates are low may result in discolouration. |
| | Buffalo Grass | 4L | 40mL | |
| | Couch varieties Greenless Park, Santa Ana, Wintergreen | | | |
| | Kikuyu | 6 to 8L | 60 to 80 mL | |

***

**Winter grass (Poa annua) Management**

| Situation | Grasses | Rate | Critical Comments |
| :--- | :--- | :--- | :--- |
| | | Per ha | Per 100m² | |
| Golf course fairways, Golf course greens | Wintergrass (Poa annua) | 0.4-1L | 4 to 10mL | See instructions under Winter Grass (Poa annua) Management for reduction of Poa annua swards in Bent Grass golf greens. See Golf course greens section above for application recommendations. |

**Bahia grass (Paspalum notatum) Suppression and Seedhead Control**

| Situation | Grasses | Rate | Critical Comments |
| :--- | :--- | :--- | :--- |
| | | Per ha | Per 100m² | |
| Common couch, Durban Grass, Hybrid Couch, Qld Blue Couch, Zoysia only In golf courses long roughs, lawns, median strips, ovals, parks, roadsides, general grassed area | (Paspalum notatum) Suppression and seedhead control | 2 to 4L plus 75 mL/ha Monument* Liquid Turf Herbicide Plus 0.25 v/v non-ionic surfactant (such as Wetspray® 1000) | 20 to 40mL plus 0.75 mL/100m² of Monument* Liquid plus 0.25 v/v non-ionic surfactant (such as Wetspray® 1000) | Apply during summer when Bahia Grass produces seedheads. DO NOT apply more than 2 consecutive applications of Monument Liquid per season. See instructions under Bahia Grass (Paspalum notatum) Management For control of Bahia Grass seedheads in established couch areas. Refer to Application section for detailed information. Important: Refer to the Monument Liquid label for specific directions on mixing, avoiding spray drift, sprayer clean-up and protection of non-target crops and the environment. |

*Always read the label before using this product or any chemical using*
*®All products mentioned are registered trademarks of their respective owners*

**Best Application Tips**
The rates recommended on the label are designed to give approximately a 20 - 50% reduction in clippings over a 2 to 6 week period. In practice, the amount of growth regulation achieved will vary due to environmental conditions and turf management regimes. As a result, it is likely that application rates will need adjustment to match growing conditions, management practices and the quantity of growth regulation required. A growing degree day model is useful to determine timings.

Repeat applications can be made as soon as turf resumes growth or more suppression is desired.
Shadow® Ultra PGR should be applied to actively growing turf, at least 6 hours before or after mowing. Good mowing practices prior to application are required to maximise performance and achieve quality turf swards. Use the lower label rate in situations when turf is going dormant due to high or low temperatures, or lack of moisture.

***

[Image: Logo of Campbell Chemicals. Text: Colin Campbell (Chemicals) Pty Ltd. Proudly Australian owned & operated Celebrating our 80th year in 2020.]

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