Chapter 15 The case for reactive greenkeeping

I’ve been sitting on this idea for a long time, and I decided April 1 would be a great day to write about it. You can decide if I’m serious.25

When we first study turfgrass management, we tend to learn a proactive approach. This approach involves growing grass and regularly doing work such as fertilization, mowing, topdressing, and cultivation. These practices are generally done on a calendar schedule, albeit a flexible one, and are designed to be proactive—from the OED, “creating or controlling a situation by taking the initiative and anticipating events or problems … innovative, tending to make things happen.”

Here’s the problem. When we make things happen with the grass, we invariably overdo things. That’s the only safe way to take a proactive approach. We don’t know exactly what is going to happen with the weather, or with the grass conditions, so we must put a little too much fertilizer, proactively apply a little too much sand, and do a little too much aeration—remember we’ve added a little too much fertilizer already—and we must mow more than we otherwise would. This is more work. Can we get great turf conditions this way? Absolutely, but this is about making things happen with the grass and by all the extra work done, creating a surface.

Grant Saunders26 has asked a few questions over the past few years that have made me think this proactive approach may not be ideal.

First there was this one ( about fertilizer: “Stupid question time: Do you apply N to stimulate growth or is N applied in response to growth?”

One can think of this in two ways. Either apply N to cause growth, or think of the plant using N, and after some point it will require more, and then reapply when it does. The first approach is proactive, and the second is reactive.

Then there was this one ( about sand: “Have we become too precious about compaction? Firmness is good for the game. Producing surfaces vs growing grass.”27

When one can get better playing surfaces with less sand, why is the industry so proactive about applying sand?

And reactive isn’t such a bad word. From the OED, it means “responds or reacts to a situation, event, etc., especially that reacts to existing circumstances, rather than anticipating or initiating new ones.” Isn’t that what one has to deal with in turfgrass management? Unpredictable weather, and grass that responds to weather just as much (or more!) as it does to any proactive greenkeeping? What if one was more reactive in responding to the grass and adjusting the work based on existing circumstances. That sounds like an excellent approach.

I predict the reactive approach to greenkeeping produces equivalent or better turf conditions than a proactive approach, and does so with less work.

One way to be reactive? Measure how much the grass grows, from that estimate nutrient use and organic matter production, and react to existing circumstances.

  1. I published the predecessor to this chapter on April 1—April Fools Day—in 2018. And I was and remain serious about this. Of course one must be proactive. But I think there is a great opportunity to improve turfgrass conditions, do less work, and have more fun doing the work, by adding a big dose of reactity to the work through a simple measurement of growth. Original post at

  2. You can find him on Twitter at or at the Hamilton GC maintenance page(

  3. Check out these two links for some context. This was this discussion ( and it was about the YouTube video ( shared by Dan Dinelli about ball bounce on a fairway topdressed with sand, or topdressed with compost. Let’s just say that the results might surprise you.