Welcome to the World of nut growing. You have just received some of the finest heartnut seeds available for Canada. The following instructions should help you to germinate these remarkable seeds.

Like other northern nut species, the heartnut requires a stratification period before it will germinate. Stratification is a long term cool moist treatment. The term "stratification" originated from the practice of burying nuts in layers with sand and then covering it all over with a three inch mulch for winter protection. A two month stratification period is a minimum for most nut seeds. It is not necessary to remove the hulls.



The seed should not be allowed to dry out when collected in the fall. The easiest seed treatment is to fall sow the seed and cover with a 3 inch mulch. This is how the squirrel does it!

If rodents are a problem, you may wish to prepare wire mesh containers (hardware cloth). Filter sand down through the containers of nuts and sink the container a few inches into the ground in a well drained location. Cover with soil and a mulch material.


Seed may be stratified in the household refrigerator. Mix the seed as soon you receive it in moistened peat moss and place it in the refigerator. Do not freeze. Check the seed periodically to see that it hasn't dried out. Plant the seed out as soon as you have the ground prepared in the spring.

Plant the seed on its side about 1-1/2 inches deep. Mark the planting site well to protect the young seedlings. Weed carefully! Heartnut seedlings usually emerge in June, so be patient. Pull away the mulch as the young seedlings emerge.

Heartnuts are just a little less hardy than the black walnut and can stand minimum temperatures of about -30°F to -40°F. They will grow in a variety of well drained soils. In areas north of Toronto, they should be sheltered from strong winter winds.

The heartnut is native to Japan and is a form of the Siebold walnut. Normally, the Siebold walnut is a rough shelled nut resembling the butternut. Occasionally it produces the heartnut form which has a smooth shell and easier cracking quality. Its botanical name is Juglans sieboldiana var cordiformis.

Aside from being an interesting ornamental tree, the heartnut produces large crops of fine flavoured nuts. It is a consistent bearer producing long clusters of well filled nuts every year. It deserves the attention of the home gardener and the commercial grower alike.

Provided by SONG. Feel free to copy with a credit.