Fundamental changes to how the model learns and handles grower input mean significantly less manual work and meaningfully better accuracy.

AMSTERDAM, March 19, 2026 — Source.ag, the data and AI platform for professional greenhouse horticulture, today announced a significant breakthrough to its AI-powered Harvest Forecast model for tomatoes. The next-generation model introduces fundamental changes to how it is trained, updated, and improved, leveraging state-of-the-art AI to continuously advance accuracy through real-world cultivation data. The result is a model that handles climate variability that no individual grower could encounter alone. The newest generation model has been available to a small group of growers for field testing, with a full rollout imminent.

The results are remarkable. At the three-week forecast horizon, mean forecast accuracy has increased by 33% compared with the previous-generation model. The share of cultivations with forecasts more than 20% off target has declined by 25%. And severe outliers, cultivations where the forecast had big misses, have been reduced by 50%

Behind these results is a fundamental change to how the model learns and develops. This next-generation model now combines the state-of-the-art from horticulture science with an AI model that learns from the setup and challenges that are unique to every greenhouse, accounting for all the ecological and logistical complexities that influence the daily harvest. Apart from increased accuracy, the most significant practical change for growers is a substantial reduction in manual input. Several data processes that previously required regular manual registrations have been automated, removing a recurring operational burden while improving forecast accuracy. Growers get more reliable numbers, with less work to produce them.

Rollout is phased, with an initial group of greenhouses already live and a broader expansion planned in the coming weeks. Full deployment to all tomato customers is expected in the coming months. This advance in AI-powered forecasting reflects the direction Source is taking the platform as a whole and marks the beginning of a much broader AI transformation that Source is driving for growers and sales teams.

“What makes this meaningful is how the model improves over time,” said Rien Kamman, CEO and Co-founder of Source.ag. “The AI model learns from every cultivation running through Source.ag, so the model’s performance compounds as more growers use the platform. That’s the direction we’ve been building towards: AI that gets better with scale, not just with manual effort.”

“The most tangible change for growers is how much less the model asks of them,” said Sebastiaan Vermeulen, Data Scientist at Source.ag. “We’ve automated several of the data processes that used to require regular manual input, which removes real friction from the grower’s week. At the same time, we made a number of changes to how the collected data is used in the new model, leading to substantial improvements in the prediction accuracy. We’ve now made it easier than ever before to hit harvest commitments, realise a better price, and reduce waste.”

About Source.ag

Source.ag is a software and data platform for professional greenhouse horticulture. The platform gives greenhouse leaders the data and AI tools to make better decisions on yield, resources, and commercial planning, covering harvest forecasting, irrigation management, and more. For operators running multiple sites, the platform provides a single view across their entire operation. Founded in 2020 by Rien Kamman and Ernst van Bruggen, Source works with operations across the world, with a mission to help feed the world in a climate-resilient and resource-efficient way.

More information: www.source.ag