Flower bulbs can be planted in any garden and/or every type of soil. The most important thing is that the part of the garden where the flower bulbs are to be planted must not become too wet during the winter. Water that remains in puddles several days after a rain will absolutely ruin a bulb border. About the only other exception involves the chequered fritillary (fritillaria meleagris) that will not grow well when planted in dry soil such as that found under a thuja. And, although heavy river clay makes it difficult to dig planting holes for tulips and narcissi, they will thrive in this type of soil.