The product makes a difference
Plant-based drinks are not all the same liquid. Recipes vary in protein, fat, processing and other ingredients. Two oat drinks can therefore foam very differently on the same machine. The Barista label indicates a version intended for coffee, but does not guarantee it suits your taste or every preparation method.
Read the packaging: this includes shaking, refrigeration after opening and consumption guidance. If you have intolerances, check the ingredients and allergen information on the specific product. Plant-based does not automatically mean allergen-free, or gluten-free in every product. We are explaining preparation here, not recommending a blanket dietary alternative.
One small comparison instead of ten failed attempts
Start by choosing one plant-based drink and a small portion. Chill it as directed and shake the carton before pouring if recommended. Use a clean jug. Always use the same quantity and the same espresso for a comparison. Otherwise, you will not know whether the better result came from the product, the amount of milk or the bean.
Introduce air carefully. Many drinks formulated for coffee benefit from gentle aeration followed by a calm rolling motion. Where possible, follow the manufacturer's recommended temperature. If none is given, start moderately and avoid boiling. More heat does not automatically make the texture more stable.
Curdling, bubbles and quick collapse
If a drink curdles in espresso, acidity, temperature and formulation may interact. First check storage and the shelf-life and use-by guidance on the pack. Do not use it if there are signs of spoilage; a normal smell alone does not prove that storage was safe. If the product is in good condition, try a lower serving temperature or another formulation intended for coffee.
Large bubbles and rapid collapse are a different problem from curdling. Try less air and a more even movement. Judge the appearance not just immediately after pouring but also after two minutes. A drink is meant to be drunk, after all, and should survive more than the first photo moment.
Choose flavour deliberately
Taste the plant-based drink without coffee too. Some varieties have distinct cereal, nut or sweet notes of their own; others are more restrained. This influences your milky coffee. A different espresso can change the combination, but before switching beans, first vary the amount of plant-based drink. Adding less lets the coffee stand out more.
A flowing texture with fine bubbles helps with Latte Art. Even if you enjoy the drink's taste, it need not produce a competition-standard heart. First find the combination you like drinking. Record the product name, amount and a brief note on texture to guide your next purchase.
Keep things clean when switching
Clean jugs and steam wands consistently. A quick wipe is not a reliable solution for people with severe allergies. At home, you can plan separate containers; in a café, clearly mention intolerances. A plant-based order alone says nothing about possible contact with milk or other allergens during preparation.