I planted three bulbs in a small vase, around 20 cm diameter, without a drainage hole. I planted them in November, outside under a roof, facing East, and watered them when the soil was dry. I'm in Amsterdam and the weather was cold, but not as cold as it usually is. Blooming was on time in the fields.
Since the season was particularly rainy this didn't happen often (even though the vase was under a roof). I got the tulip plants to grow up to 15 cm, with three green sprouts that seemed to be in perfect health, as the blooming period approached. Then, in just 10 days, some yellowing appeared on the borders and the tips, and it spread to the whole plants. This is the final, sad result that puts my efforts to grow something in the dust. Poor things.
What did I do wrong? It is the first time I tried to grow something. Also, do you think these bulbs can still be reused next year?