Dear Alberto! Thank you for answering my fertilizer question in such a detailed way. It helped me a lot and apparently my feeling that concerning bulbs less is more was right. When exactly do you feed your bulbs (are they yours or do they belong to the botanical garden?). After the dry summer dormancy period or in spring when they are about to bloom? I´ve got some mediterranean bulbs (Moraea sisyrinchium, Dipcadi serotinum, Allium roseum, Narcissus jonquilla, N. triandrus, Leucojum trichophyllum,...). They live on my balcony and have just started to produce leaves. It´s very thrilling to see that fresh green appears in those pots that have been dormant and dry all summer long. Best wishes Verena Konstanz, Germany