The number of bulbs planted per square metre is a matter of taste. When you use the bulbs to cheer up a perennial border people nowadays often choose to plant them loosely.
Jacqueline van der Kloet, garden designer and uncrowned Queen of the bulb industry, advises to mix all the colours you want in a wheelbarrow and gently throw them through the border. On the spot each bulb has landed you plant it. This will be a little bit thicker in one place and hardly anything on another place.
Almost always this way of planting creates a very harmonious and natural look in the springtime and the colour theme you choose as well as all the individual bulbs are often at their best when planted this way.
Spacing of the bulbs per square metre
But if you want to create bulbs plantings like you see in Keukenhof with solid plantings full of colour you should stick to the following numbers per square metre:
Springblooming flower bulbs
|Allium large flowering (like Globemaster)||10|
|Allium mid sized (like Purple Sensation)||40|
|Allium small (like moly)||120|
|Daffodils miniature (like Tete a Tete)||80|
|Fritillaria big (like imperialis)||15|
|Fritillaria small (like meleagris)||100|
|Iris small (like reticulata)||100|
|Tulips miniature (like bakeri Lilac Wonder)||120|
Summerblooming flower bulbs
In these cases we take the view that you use the top sized bulbs like they are offered in our web shops, when you use smaller bulbs you need to add up a little to numbers.