Spring maintenance determines turf resilience in summer

ARTICLE

Wijnand Meijboom, Wednesday 15 April 2026

219 sec

In spring, conditions for grass growth are favourable. The real challenge for greenkeepers and field managers only begins when temperatures rise, rainfall decreases and usage intensifies. According to Ramon Timmermans of ICL, a successful summer already starts in April and May.

Ramon Timmermans

"Getting grass to grow is not the biggest challenge in this period," he says. "It is about preparing the surface so it can handle summer stress. You are laying the foundation now for the period when it really matters. In general, professionals know exactly where the weak spots are; they know the history of the pitch or course and what works and what does not. But the key question remains: how do you ensure your turf continues to perform under stress?"

According to Timmermans, everything starts with a good restart after winter. Many managers choose a fast-acting fertiliser to kick-start growth. "You want the grass to become active quickly and start growing. Then you build further by gradually lowering the mowing height, allowing the grass to tiller better and the sward to close. That creates a strong base." This base is essential because summer conditions are completely different. Higher temperatures and drought slow growth, while usage increases. "On golf courses, summer sees the highest traffic. That puts extra pressure on the turf. If it is not resilient enough, problems will arise."

"You can apply as much nutrition as you like, but without moisture nothing happens"

One of the key focus points in summer is water, or more precisely: large fluctuations in moisture availability for the plant. "You can apply as much nutrition as you like, but without moisture nothing happens," says Timmermans. "Water, alongside light and carbon dioxide, is an essential primary resource for photosynthesis." This highlights the importance of a wetting agent. This tool improves water infiltration and distribution in the soil. "What you often see under dry conditions is that the soil becomes hydrophobic. That means it repels water instead of absorbing it. This leads to dry spots, so-called dry patches." According to Timmermans, it is important to start using a wetting agent in time. "Do not wait until problems become visible. Start in late spring, so your moisture balance is already in place before drought sets in."

Multi Level Moisture Management Technology

ICL Growing Solutions recently introduced the granular wetting agent TriSmart. According to Timmermans, this product builds on existing technology but adds several improvements. "TriSmart works at multiple depths in the soil, influencing water at different levels. The formulation reduces the surface tension of water, allowing it to penetrate the soil faster and more evenly. This creates a more stable moisture balance in the top layer, where the grass plant absorbs most of its water. The result is that sufficient moisture remains available for the plant, while excess water is efficiently drained. In addition, the carrier acts as a source of slow-release potassium, calcium and magnesium, supporting plant growth. That is the strength of the TriSmart technology."

"Irrigation is increasingly restricted by regulations and water availability. You need to use the water you have more efficiently"

The need to use water more efficiently is increasing. Timmermans points to developments such as irrigation bans and limited, more expensive water supplies. "Irrigation is increasingly restricted by regulations and water availability. You need to use the water you have more efficiently." A wetting agent can make a difference. "If you can extend the period between irrigation cycles, you gain more flexibility. Especially in situations with less supervision, such as amateur clubs, that can be the difference between a good surface and problems." The use of a granular wetting agent is relatively simple. "You apply it and it works over a longer period, often around two months. That makes it a solid base." This distinguishes it from liquid variants, which offer more precision but require more frequent application. "Both approaches can complement each other. You can choose what best fits your situation." Application also differs by sector. On golf courses, the focus is often on greens, where quality standards are high and summer pressure is significant. On sports fields, renovation periods also play a role. "After seeding, you want optimal conditions for germination and growth. Then a good moisture balance is crucial."

"A wetting agent is purely for moisture management. Alongside that, you have your fertilisation"

The use of these technologies involves costs. Still, Timmermans sees more managers willing to invest. The level of use depends strongly on the desired quality level. For top-level pitches and greens, this is often standard, while budgets play a bigger role for amateur fields. "But even there, you see a search for more efficient ways of working and preventing problems." He also points to a key moment when amateur clubs can benefit from wetting agents: immediately after renovation. "Grass seed is expensive. The last thing you want is half of it failing due to moisture problems in a dry May or June. In that case, a wetting agent clearly makes a difference." Although important, a wetting agent is not a standalone solution. According to Timmermans, it is about combining measures. "A wetting agent is purely for moisture management. Alongside that, you have your fertilisation." He emphasises the importance of a balanced fertilisation programme, with both granular and liquid products. "A controlled-release fertiliser provides a constant base. With a liquid fertiliser, you can make adjustments and give the grass an extra boost when needed." He also mentions Greenmaster Liquid Advanced, a liquid fertiliser with biostimulants. "It contributes to the resilience of the grass plant. Especially towards summer, that is important. You want the grass to withstand drought, stress and intensive use." According to Timmermans, research shows that the combination of a granular base and liquid supplementation delivers the best results. "You ensure continuous nutrition without peaks and troughs. That helps maintain turf quality."

"Summer starts in spring. If you make the right choices then, you will benefit later"

According to Timmermans, the core message remains simple: think ahead. "Summer starts in spring. If you make the right choices then, you will benefit later." His advice is clear: "Lay your foundation now: ensure proper fertilisation, start on time with a reliable wetting agent and focus on improving turf resilience. That way, you can better cope with the stressful period ahead." Ultimately, it all comes down to the same goal: a strong, sustainable and high-quality turf surface. "Whether it is a golf green or a sports field, you want the grass to perform when it matters. And that starts with good preparation."

This article was previously published on 8 April 2026 on the Greenkeeper](https://www.greenkeeper.nl/article/53601/voorjaarsonderhoud-is-bepalend-voor-een-weerbare-grasmat-in-de-zomer]Greenkeeper) website.

ICL Specialty Fertilizers

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