SWEET CHERRY VARIETIES
For good cherry yields, appropriate pollination must be guaranteed. Only a few, mostly newer breeds (Sweetheart, Lapins, Celeste...) are self-fertile.
It is a well-known fact that not all varieties are compatible with each other.
Scientific institutes have found out that each variety has 2 sterility factors (S-alleles). If a pollen with the same S alleles reaches a flower, it cannot grow through to an ovum in the ovary. Only varieties with different S values are compatible. If only one of the S values is different, only 50% of pollen can be pollinated. Since, depending on the flowering strength, less than half of the flowers usually have to become cherries for a normal yield, it is usually sufficient if the type of pollinator differs in one S-allele.
In addition, the blossoming process of the variety must more or less coincide with the one of the pollinator. However, if a variety ripens relatively early it does not mean that its time of blooming is also early. Sweetheart, for example, flowers very early and ripens very late.
That is why we have listed both, the S-allele and the blooming date of the respective variety, in the following variety description. In order to enable sufficient pollination, the type of pollinator should have at least one differing S-allele; concerning the blooming time it should only differ by one category (e.g. medium-late blooming for late blooming) and the pollinator tree should not stand more than 30 m away.
Video about pollination
S-alleles: S3 S9 Blooming time: medium early
Ripens in the second week of the cherry season, i.e. in our country in the first decade of June, and is the most widely planted early variety in the world, although it does not yet have the same high transport rigidity, burst resistance and yield as many late varieties. The fruit is large, firm fleshed, juicy and sweet; short-stalked; very attractive, aromatic, tasty early heart cherry; the tree grows strong and steep;
S-alleles: S1 S2 Blooming time: moderately late
ripens about three days before Van and is the largest (up to 13g) cherry from Summerland. The fruit is dark red in colour, strong in taste, medium firm and moderately burst resistant; blossoms moderately late; the tree grows medium strong, upright and produces good yields; due to its excellent fruit size Summit is an important variety in European commercial cultivation.
S-alleles: S3 S12 Blooming time: late
Fifth ripening week; end of June; The fruits are very large, dark red, smooth and firm fleshed; very good fruit quality but very sensitive to bursting; good transport and cold storage stability; delayed start of yield and irregular yield performance; fast-growing.
S-alleles: S3 S6 Blooming time: moderately late
ripens in the sixth cherry week, late June to early July; it is very big in size, brown-red in colour, very firm and crisp, harmonious in taste and aroma; very high burst resistance; Kordia usually hangs loosely and evenly spread on the tree, which causes a rapid drying-off of the fruits after rainfall and a very uniform fruit size; early start of yield and high yield. These advantages have made Kordia our most important variety in the medium-late ripening period for commercial fruit growing, despite its sensitivity to frost.
S-alleles: S1 S4' Blooming time: early
is a self-fertile, large, crisp, heart cherry from Canada and the main variety in cherry cultivation there. Despite its early blossoming, it is very rich and reliable in yield.
S-alleles: S1 S3 Blooming time: very late
It is truly a queen of cherries and ripens during the seventh cherry week, from the beginning to mid-July. It produces very large fruits, is aromatic-juicy and refreshing, sweet with a small stone that can be easily removed. It is reddish-brown on the entire surface and dark red when fully ripe. The high fruit set is the most outstanding feature of the Regina variety; it produces early and good yields; it is also very burst resistant.
S-alleles: S4 S6' Blooming time: very late
This Czech new variety from Holovusy ripens at the same time as Regina, blossoms just as late, but has 2 other S alleles. These characteristics and the fact that she looks amazingly similar to Regina make her particularly interesting as a pollinator for Regina in commercial cultivation, if you plan every 10th tree in a row as a pollinator but want to harvest it at the same time. The fruits are very attractive, heart-shaped, dark red - shiny and with a fruity aroma. The tree grows medium strong - strong, branches well, somewhat more upright than Regina.
NEW SWEET CHERRY VARIETIES
S-alleles: S5 S22 Blooming time: very early
ripens 8-10 days before Burlat, is medium in size, rather soft fleshed and dark red in colour.
The tree grows weakly and begins to bear very early, the blossoming is very early, self-sterile, good pollinators are Earlise®, Bellise®, Samba®, Moreau,...
S-allele: S1 S9 Blooming time: early
ripens 1-3 days before Burlat and is 1-2g larger than Burlat, firmer in the flesh, but somewhat more sensitive to bursting.
The tree grows strong and ample, has almost hanging branches and does not grow as erect as Burlat. The yields are earlier than those of Burlat and are also higher. It blooms 1-2 days before Burlat, not self-fertile (pollinators: Burlat, Samba,..).
S-allele: S1 S9 Blooming time: early
ripens 3 to 5 days after Burlat, is a very large fruit, strongly red in colour, very good and medium firm in the flesh. Bellise® is very high-yielding, blossoms early and is self-sterile, pollinators are Samba®, Sweetheart®,...
S-alleles Blooming time: medium early (shortly after Burlat)
Rocket® ripens 1 week after Burlat, is very large fruit (30-34mm) with a very good pulp firmness. The fruit is heart-shaped (almost pointed), very sweet, very good in taste and dark red in colour.
The tree grows very strongly, low-growing rootstocks such as GiSeLa 5 are definitely recommended for good yields. Sufficient and suitable types of pollinators must also be ensured.
Due to its enormous fruit size and pulp firmness, Rocket® is very sensitive to bursting and should only be planted in professional cultivation with a foil canopy.
S-alleles: S1 S4 Blooming time: medium early
Frisco® ripens 10 -14 days after Burlat, between Sabrina® and Carmen®. The strong red fruit is very large (28-32mm), very firm fleshed, very sweet and very good in taste.
The tree grows vigorously and produces early and very high yields.
Like Rocket®, Frisco® should be protected from bursting with a rain cover.
S-alleles: S4 S5 Blooming time: moderately late
ripens 10-12 days after Burlat, is a very large fruit (9-13g), long-stalked and very attractive. The fruit is juicy, kidney-shaped, bright red in colour, with a harmonious sugar-acid ratio. The tree is very high-yielding, grows medium to weak and garnishes very well; very good for spindling. The blossoming is medium late, self-sterile, good pollinators are Summit, Schneiders, Merchant, Canada Giant®, Giorgia,...
S-alleles: S1 S9 Flowering time: Medium early
ripens in the 5th to 6th cherry week, at the same time or shortly before Kordia, and is a new variety from the Czech breeding station Holovousy. It is currently one of our largest cherries, broad kidney-shaped, dark red and slightly marbled. The flesh is very firm, crisp and of very good quality. The tree grows vigorously with a loose, slightly hanging crown structure and produces regular and good yields.
S-alleles: S3 S6 Blooming time: very late
ripens 2-3 days after Regina and is a good pollinator for it because of its late bloom. Fertard® is also better in yield and fruit size, and Regina performs slightly better in taste. The fruit is heart-shaped, tall with a long stalk, is very crisp and has good resistance to bursting. Good pollinators are Regina, Summit, Canada Giant, Sylvia, Schneiders,...